Document:

<PAGE>   1
                                                                    EXHIBIT 10.5

                    FOURTH AMENDMENT TO AMENDED AND RESTATED
                         REVOLVING CREDIT, TERM LOAN AND
                           GOLD CONSIGNMENT AGREEMENT

         Fourth Amendment dated as of June 26, 2000 (the "Amendment") amending
that certain Amended and Restated Revolving Credit, Term Loan and Gold
Consignment Agreement dated as of September 10, 1998 (as amended and in effect
from time to time, the "Credit Agreement"), by and among (a) Whitehall
Jewellers, Inc. (f/k/a Marks Bros. Jewelers, Inc.), a Delaware corporation (the
"Borrower"); (b) Fleet Capital Corporation, LaSalle Bank National Association
(f/k/a LaSalle National Bank), ABN AMRO Bank N.V. and the other lending
institutions which are now parties thereto (collectively, the "Banks"); and (c)
Fleet Capital Corporation, as Collateral Agent, Administrative Agent and
Syndication Agent for the Agents as herein defined and the Banks and LaSalle
Bank National Association and ABN AMRO Bank N.V., each as Syndication Agent for
the Agents and the Banks (the Collateral Agent, Administrative Agent and
Syndication Agents are collectively referred to as the "Agents"). Capitalized
terms used herein and which are not otherwise defined shall have the respective
meanings ascribed thereto in the Credit Agreement.

         WHEREAS, the Borrower and the Banks have agreed to modify certain terms
and conditions of the Credit Agreement as specifically set forth in this
Amendment;

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements contained herein and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
hereby agree as follows:

         SS.1. AMENDMENTS TO DEFINITIONS.

         (a) Section 1.1 of the Credit Agreement is hereby amended by deleting
the definition of "Maturity Date" in its entirety and replacing it with the
following new definition:

              "Maturity Date. June 30, 2004."

         (b) Section 1.1 of the Credit Agreement is hereby amended by deleting
the definition of "Total Revolver Commitment" in its entirety and replacing it
with the following new definition:

              "Total Revolver Commitment. The sum of the Commitments of the
         Banks, as in effect from time to time, such amount being equal to
         $150,000,000 as of June 26, 2000."

         (c) Section 1.1 of the Credit Agreement is hereby amended by inserting
after the definition of "Subsidiary" the following new definition:
<PAGE>   2
                                      -2-

              "Super Majority Banks. As of any date, the Banks (other than
         Delinquent Banks) whose aggregate portions of the outstanding amount of
         the Term Loan and whose aggregate Commitments together constitute at
         least sixty-six and two-thirds percent (66 2/3%) of the Total
         Commitment."

         SS.2. AMENDMENTS TO PRICING. Section 7.22 of the Credit Agreement is
hereby amended by (a) deleting the last tier of the table set forth therein and
replacing it with the following new tier:

<TABLE>
<S>                        <C>               <C>                <C>               <C>             <C>
--------------------------------------------------------------------------------------------------------------
     less than             1.000%            1.375%             0.00%             0.25%           0.250%
     1.50:1.00
--------------------------------------------------------------------------------------------------------------
</TABLE>

         SS.3. AMENDMENTS TO NEGATIVE COVENANTS.

         (a) Section 11.3(f) of the Credit Agreement is hereby amended by
         deleting it in its entirety and replacing it with the following:

                    "(f) Investments by the Borrower in the assets of any other
              Person or in all of the stock of any other Person ("Acquisition
              Investments"), provided that (i) (A) the maximum aggregate amount
              of all such Acquisition Investments after June __, 2000, shall not
              exceed $40,000,000 in the aggregate (the "Acquisition Cap"), (B)
              no single acquisition of a business or assets in the retail
              jewelry business may exceed $20,000,000 in the aggregate, (C) no
              single acquisition of a business or assets not currently in or
              used in the retail jewelry business may exceed $10,000,000 and
              such business or assets must be converted to the retail jewelry
              business within six months of the date of acquisition and (D)
              after giving effect to any Acquisition Investment the lesser of
              Borrowing Base and the Total Revolver Commitment shall exceed the
              Outstanding Facility Amounts by not less than $10,000,000,
              provided, however, that if the foregoing criteria in respect of
              this (i) are not satisfied in respect of any Acquisition
              Investment, the Borrower may effect such Acquisition Investment
              with the consent of the Super Majority Banks (it being understood
              that the Banks shall not seek any special fees in connection with
              the granting of such consent if the purchase price for such
              Acquisition Investment is greater than $20,000,000 and less than
              the amount available under the Acquisition Cap), (ii) after giving
              effect to any such proposed Acquisition Investment, in the case of
              any stock acquisition, the Borrower shall own 100% of the issued
              and outstanding capital stock of such other Person, (iii)
              immediately before each such proposed Acquisition Investment and
              after giving effect thereto, there shall be no Default or Event of
              Default, (iv) any Acquisition Investment which results in a change
              in control of the Person in which the Acquisition Investment is
              made shall have been approved by the Board of

<PAGE>   3
                                      -3-

              Directors of such Person prior to the making of such Acquisition
              Investment, and (v) the Borrower shall have complied in all
              respects with ss.10.19 hereof. In addition, if at the end of any
              fiscal quarter the ratio of Consolidated Total Funded Debt to
              Consolidated EBITDA (calculated in accordance with ss.7.22 hereof)
              is less than 2.00 to 1.00, the Acquisition Cap will be reset to
              $40,000,000 (irrespective of Acquisition Investments made prior to
              such date). Accounts Receivable, Inventory and Precious Metal of
              any Acquisition Investment shall (y) not be included in the
              Borrowing Base until the Administrative Agent has completed a
              collateral exam of such assets and (z) such assets will be
              included in the Borrowing Base at lending formulas and with
              eligibility criteria determined by the Administrative Agent based
              upon such exams."

         (b) Section 11.4 of the Credit Agreement is hereby amended by deleting
         it in its entirety and replacing it with the following:

              "11.4. DISTRIBUTIONS. The Borrower will not make any
              Distributions, except for (a) repurchases of the Borrower's Class
              B common stock in an aggregate amount not to exceed $150,000 for
              all such repurchases, and (b) repurchases of its common stock in
              an aggregate amount not to exceed $15,000,000, so long as no
              Default or Event of Default has occurred or is continuing."

         (c) Section 11.5.2 of the Credit Agreement is hereby amended by (i)
         deleting the words "and (f)" and replacing them with the words "(f)"
         and (ii) inserting after the words "of which will be approximately
         $2,000,000" the words "; and (g) notwithstanding anything to the
         contrary contained elsewhere in any loan documents, non-exclusive
         licenses of intellectual property including trademarks and tradenames,
         and outside the United States, exclusive licenses of such intellectual
         property".

         SS.4. AMENDMENTS TO FINANCIAL COVENANTS.

         (a) Section 12.1 of the Credit Agreement is hereby amended by deleting
         the table contained therein and replacing it with the following new
         table:

<TABLE>
<CAPTION>
                        Period                               Ratio
                        ------                               -----
<S>                                                          <C>
                        5/01/00 - 10/31/00                   3.00:1.0
                        11/01/00 - 10/31/01                  2.50:1.0
                        11/01/01 and Thereafter              2.25:1.00
</TABLE>

         (b) Section 12.2 of the Credit Agreement is hereby amended by deleting
         the table contained therein and replacing it with the following new
         table:
<PAGE>   4
                                      -4-

<TABLE>
<CAPTION>
                      Fiscal Year                           Amount
                      -----------                           ------
<S>                                                         <C>
                      2/01/00 - 1/31/01                     $25,000,000
                      2/01/01 - 1/31/02                     $29,000,000
                      2/01/02 - 1/31/03                     $31,000,000
                      2/01/03 - 1/31/04                     $33,000,000
</TABLE>

         (c) Section 12.5 of the Credit Agreement is hereby amended by deleting
the table contained therein and replacing it with the following new table:

<TABLE>
<CAPTION>
                       Period or Date                        Amount
                       --------------                        ------
<S>                                                          <C>
                       7/31/00                               $40,500,000
                       10/31/00                              $41,000,000
                       01/31/01-04/30/01                     $42,000,000
                       07/31/01-10/31/01                     $43,000,000
                       01/31/02                              $50,000,000
                       04/31/02                              $50,500,000
                       07/31/02                              $51,000,000
                       10/31/02                              $51,500,000
                       01/31/03                              $55,000,000
                       04/30/03                              $55,500,000
                       07/31/03                              $56,000,000
                       10/31/03                              $56,500,000
                       01/31/04                              $57,000,000
                       04/30/04                              $57,500,000
</TABLE>

         SS.5. GENERAL AMENDMENT RELATING TO SOVEREIGN BANK AS GOLD FRONTING
BANK.

              (a) References in the following definitions of the Credit
         Agreement to the "Administrative Agent" shall hereinafter be deemed to
         be references to "Sovereign Bank as Gold Fronting Bank":

              "Consigned Precious Metal", "Consignment Base Rate", "Consignment
         Conversion Request", "Consignment Fixed Rate", "Fair Market Value",
         "Gold Commitment Percentage", "Gold Fronting Banks", "Redeliver(ed) or
         Redelivery" and "Spot Value";

              (b) References in ss.6 (except for the first reference in
         paragraph 6.4(a)) to the "Administrative Agent" shall hereinafter be
         deemed to be references to "Sovereign Bank as Gold Fronting Bank":

              (c) References in the following sections of the Credit Agreement
         to the "Administrative Agent" or "Agents" shall hereinafter be deemed
         to be references to "the Administrative Agent and Sovereign Bank as
         Gold Fronting Bank":
<PAGE>   5
                                      -5-

               ss.ss.7.13.1, 17 and 20

              (d) From time to time the Administrative Agent shall place
         administrative caps on the Fair Market Value of Consigned Precious
         Metal (the "Administrative Cap"). Initially the Administrative Cap
         shall be $22,000,000. Prior to making any Purchase and Consignments and
         upon any increase in the Fair Market Value which in either case would
         cause the Fair Market Value of Consigned Precious Metal to exceed the
         Administrative Cap, Sovereign Bank as Gold Fronting Bank shall notify
         the Administrative Agent and shall consult with the Administrative
         Agent to determine that the Borrowing Base exceeds the Outstanding
         Facility Amounts.

         SS.6. AMENDMENT TO SCHEDULES AND REALLOCATION OF TERM LOANS. Schedule 1
to the Credit Agreement is hereby amended by deleting it in its entirety and
replacing it with the Schedule 1 attached hereto. To the extent that any Bank's
Term Loan is to be increased based upon the changes to Schedule 1, such Bank
shall make such additional funds available to the Borrower on the effectiveness
of this Amendment as Term Loans in the amount of such increase. To the extent
that any Bank's Term Loan is to be reduced based upon the changes to Schedule 1,
the Borrower shall make a payment to such Bank on the effectiveness of this
Amendment in the amount of such decrease as a payment of such Bank's Term Loan.

         SS.7. CONDITIONS TO EFFECTIVENESS. This Amendment shall not become
effective until the Administrative Agent receives (i) a counterpart of this
Amendment, executed by each of the Borrower, the Agents and each of the Banks,
(ii) amended and restated Revolving Credit Notes and Term Notes for each Bank
executed by the Borrower in the amount of such Bank's Commitment and amount of
the Term Loans, (iii) an opinion of Borrower's counsel in form and substance
satisfactory to the Agent and (iv) an amendment fee in the amount of $374,625
(i.e. 22.5bps of the Total Revolver Commitment and the amount of the Term Loans,
such fee to be allocated pro rata among the Banks.

         SS.8. REPRESENTATIONS AND WARRANTIES. The representations and
warranties of the Borrower contained in the Credit Agreement were true and
correct when made and continue to be true and correct on and as of the date
hereof as if made on the date hereof except to the extent of changes resulting
from transactions contemplated or permitted by the Credit Agreement and to the
extent that such representations and warranties relate expressly to an earlier
date. No Default or Event of Default has occurred and is continuing.

         SS.9. RATIFICATION, ETC. Except as expressly amended hereby, the Credit
Agreement and all documents, instruments and agreements related thereto,
including, but not limited to the Security Documents, are hereby ratified and
confirmed in all respects and shall continue in full force and effect. The
Credit Agreement and this Amendment shall be read and construed as a single
agreement. All references in the Credit Agreement or any related agreement or
instrument to the Credit Agreement shall hereafter refer to the Credit Agreement
as amended hereby.
<PAGE>   6
                                      -6-

         SS.10. NO WAIVER. Nothing contained herein shall constitute a waiver
of, impair or otherwise affect any Obligations, any other obligation of the
Borrower or any rights of the Agents or the Banks consequent thereon.

         SS.11. COUNTERPARTS. This Amendment may be executed in one or more
counterparts, each of which shall be deemed an original but which together shall
constitute one and the same instrument.

         SS.12. GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS
(WITHOUT REFERENCE TO CONFLICT OF LAWS).

               [THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK]

<PAGE>   7

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
a document under seal as of the date first above written.

                                  WHITEHALL JEWELLERS, INC. (f/k/a Marks
                                  Bros. Jewelers, Inc.)

                                  By:
                                     -------------------------------------------
                                      Name:
                                      Title:

                                  FLEET CAPITAL CORPORATION,
                                  individually and as Administrative Agent, as
                                  Collateral Agent and as Syndication Agent

                                  By:
                                     -------------------------------------------
                                      Name:
                                      Title:

                                  LASALLE BANK NATIONAL ASSOCIATION,
                                  individually and as Syndication Agent

                                  By:
                                     -------------------------------------------
                                      Name:
                                      Title:

                                  ABN AMRO BANK N.V., individually and as
                                  Syndication Agent

                                  By:
                                     -------------------------------------------
                                      Name:
                                      Title:

                                  By:
                                     -------------------------------------------
                                      Name:
                                      Title:

<PAGE>   8

                                  THE CHASE MANHATTAN BANK

                                  By:
                                     -------------------------------------------
                                      Name:
                                      Title:

                                  BANK OF AMERICA, N.A.

                                  By:
                                     -------------------------------------------
                                      Name:
                                      Title:

                                  SOVEREIGN BANK NEW ENGLAND

                                  By:
                                     -------------------------------------------
                                      Name:
                                      Title:<PAGE>   1
                                                                    EXHIBIT 10.6

                     FIFTH AMENDMENT TO AMENDED AND RESTATED
                         REVOLVING CREDIT, TERM LOAN AND
                           GOLD CONSIGNMENT AGREEMENT

         Fifth Amendment dated as of August 18, 2000 (the "Amendment") amending
that certain Amended and Restated Revolving Credit, Term Loan and Gold
Consignment Agreement dated as of September 10, 1998 (as amended and in effect
from time to time, the "Credit Agreement"), by and among (a) Whitehall
Jewellers, Inc. (f/k/a Marks Bros. Jewelers, Inc.), a Delaware corporation (the
"Borrower"); (b) Fleet Capital Corporation, LaSalle Bank National Association
(f/k/a LaSalle National Bank), ABN AMRO Bank N.V. and the other lending
institutions which are now parties thereto (collectively, the "Banks"); and (c)
Fleet Capital Corporation, as Collateral Agent, Administrative Agent and
Syndication Agent for the Agents as herein defined and the Banks and LaSalle
Bank National Association and ABN AMRO Bank N.V., each as Syndication Agent for
the Agents and the Banks (the Collateral Agent, Administrative Agent and
Syndication Agents are collectively referred to as the "Agents"). Capitalized
terms used herein and which are not otherwise defined shall have the respective
meanings ascribed thereto in the Credit Agreement.

         WHEREAS, the Borrower and the Banks have agreed to modify certain terms
and conditions of the Credit Agreement as specifically set forth in this
Amendment;

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements contained herein and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
hereby agree as follows:

         SS.1. AMENDMENTS TO CREDIT AGREEMENT.

         (a) Section 11.4 of the Credit Agreement is hereby amended by deleting
it in its entirety and replacing it with the following:

              "11.4. DISTRIBUTIONS. The Borrower will not make any
              Distributions, except for (a) repurchases of the Borrower's Class
              B common stock in an aggregate amount not to exceed $150,000 for
              all such repurchases, and (b) repurchases of its common stock in
              an aggregate amount not to exceed $20,000,000, so long as no
              Default or Event of Default has occurred or is continuing."

         (b) References in ss.18 and 19 of the Credit Agreement to the
"Administrative Agent" or "Agents" shall hereinafter be deemed to be references
to "the Administrative Agent and Sovereign Bank as Gold Fronting Bank".

         SS.2. CONDITIONS TO EFFECTIVENESS. This Amendment shall not become
effective until the Administrative Agent receives a counterpart of this
Amendment, executed by each of the Borrower, the Agents and the Majority Banks.
<PAGE>   2
                                      -2-

         SS.3. REPRESENTATIONS AND WARRANTIES. The representations and
warranties of the Borrower contained in the Credit Agreement (including, without
limitation, the representation regarding litigation contained in Section 9.7
thereof) were true and correct when made and continue to be true and correct on
and as of the date hereof as if made on the date hereof except to the extent of
changes resulting from transactions contemplated or permitted by the Credit
Agreement and to the extent that such representations and warranties relate
expressly to an earlier date. No Default or Event of Default has occurred and is
continuing.

         SS.4. RATIFICATION, ETC. Except as expressly amended hereby, the Credit
Agreement and all documents, instruments and agreements related thereto,
including, but not limited to the Security Documents, are hereby ratified and
confirmed in all respects and shall continue in full force and effect. The
Credit Agreement and this Amendment shall be read and construed as a single
agreement. All references in the Credit Agreement or any related agreement or
instrument to the Credit Agreement shall hereafter refer to the Credit Agreement
as amended hereby.

         SS.5. NO WAIVER. Nothing contained herein shall constitute a waiver of,
impair or otherwise affect any Obligations, any other obligation of the Borrower
or any rights of the Agents or the Banks consequent thereon.

         SS.6. COUNTERPARTS. This Amendment may be executed in one or more
counterparts, each of which shall be deemed an original but which together shall
constitute one and the same instrument.

         SS.7. GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED
IN ACCORDANCE WITH, THE LAWS OF THE COMMONWEALTH OF MASSACHUSETTS (WITHOUT
REFERENCE TO CONFLICT OF LAWS).

               [THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK]

<PAGE>   3

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
a document under seal as of the date first above written.

                                  WHITEHALL JEWELLERS, INC. (f/k/a Marks
                                  Bros. Jewelers, Inc.)

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  FLEET CAPITAL CORPORATION,
                                  individually and as Administrative Agent, as
                                  Collateral Agent and as Syndication Agent

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  LASALLE BANK NATIONAL ASSOCIATION,
                                  individually and as Syndication Agent

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  ABN AMRO BANK N.V., individually and as
                                  Syndication Agent

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

<PAGE>   4

                                  THE CHASE MANHATTAN BANK

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  BANK OF AMERICA, N.A.

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

                                  SOVEREIGN BANK NEW ENGLAND

                                  By:
                                     -------------------------------------------
                                     Name:
                                     Title:

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