Document:

<PAGE>
                                                                  Exhibit 10.5.6

                                 July 12, 2004

Odimo Incorporated
14001 NW 4th Street
Sunrise, Florida 33325

          Re:      RESTRICTIONS ON TRANSFER OF SHARES UNDERLYING STOCK OPTIONS

Ladies and Gentlemen:

         In March 2004, Odimo Incorporated granted to Jeff Kornblum ("Employee")
the option to acquire 1,460,000 shares of the Company's Common Stock (the
"Option Shares") upon the terms and subject to the conditions of that certain
Stock Option Agreement dated March 1, 2004, a copy of which is attached hereto
and incorporated by reference into this letter agreement (the "Stock Option").

         Employee irrevocably agrees, for the benefit of the Company, that,
without the prior written consent of the Company, Employee will not (and will
not announce or disclose any intention to), directly or indirectly,

                  o        offer, sell, assign, transfer, pledge, encumber,
                           agree or contract to sell, grant an option to
                           purchase or enter into any transaction or device that
                           is designed to, or could reasonably be expected to,
                           result in the disposition by any person at any time
                           in the future of, or

                  o        enter into any swap, derivative or transaction or
                           other arrangement that transfers to another, in whole
                           or in part, any of the economic benefits or risks of
                           ownership of,

the Option Shares (the "Restricted Option Shares") in the amounts and during the
periods set forth below (the `Lock-Up Period"):

                               OPTION SHARES          LOCK-UP PERIOD
                               -------------          --------------
                                  486,667           3/1/04 to 2/28/05
                                  486,666           3/1/04 to 2/28/06
                                  -------
                                  973,333

Notwithstanding anything contained herein to the contrary, if pursuant to that
certain Employment Agreement dated July 12, 2004 between the Company and
Employee, Employee's employment is terminated by the Company for "cause" or
Employee resigns, any unexercised Stock Options shall terminate immediately, and
any Restricted Option Shares held by Employee may be purchased by the Company at
the exercise price per share paid by Employee. If, pursuant to the Employment
Agreement, Employee's employment is terminated by the Company other than for
"cause"(as defined in the Employment Agreement) then this letter agreement shall
terminate and all restrictions contained in this letter agreement shall be of no
further force or effect.

         Employee agrees and consents to the entry of stop transfer instructions
with the Company's transfer agent against the transfer of any Restricted Option
Shares if such transfer would constitute a violation or breach of this
agreement.

<PAGE>

         Upon request, Employee will execute any additional documents necessary
in connection with enforcement of this letter agreement. Employee hereby
represents and warrants that he has full power and authority to enter into this
agreement. This letter agreement shall be binding on Employee and his
successors, heirs, personal representatives and assigns.

                                       Very truly yours,

                                       /s/ Jeff Kornblum
                                       -----------------------------------------
                                       Jeff Kornblum

                                       2<PAGE>
                                                                  Exhibit 10.5.7

                                 July 12, 2004

Odimo Incorporated
14001 NW 4th Street
Sunrise, Florida 33325

        Re:      RESTRICTIONS ON TRANSFER OF SHARES UNDERLYING STOCK OPTIONS

Ladies and Gentlemen:

         In March 2004, Odimo Incorporated granted to Amerisa Kornblum
("Employee") the option to acquire 576,000 shares of the Company's Common Stock
(the "Option Shares") upon the terms and subject to the conditions of that
certain Stock Option Agreement dated March 1, 2004, a copy of which is attached
hereto and incorporated by reference into this letter agreement (the "Stock
Option").

         Employee irrevocably agrees, for the benefit of the Company, that,
without the prior written consent of the Company, Employee will not (and will
not announce or disclose any intention to), directly or indirectly,

                  o        offer, sell, assign, transfer, pledge, encumber,
                           agree or contract to sell, grant an option to
                           purchase or enter into any transaction or device that
                           is designed to, or could reasonably be expected to,
                           result in the disposition by any person at any time
                           in the future of, or

                  o        enter into any swap, derivative or transaction or
                           other arrangement that transfers to another, in whole
                           or in part, any of the economic benefits or risks of
                           ownership of,

the Option Shares (the "Restricted Option Shares") in the amounts and during the
periods set forth below (the `Lock-Up Period"):

                               OPTION SHARES          LOCK-UP PERIOD
                               -------------          --------------
                                  192,000           3/1/04 to 2/28/05
                                  192,000           3/1/04 to 2/28/06
                                  -------
                                  384,000

Notwithstanding anything contained herein to the contrary, if pursuant to that
certain Employment Agreement dated July 12, 2004 between the Company and
Employee, Employee's employment is terminated by the Company for "cause" or
Employee resigns, any unexercised Stock Options shall terminate immediately, and
any Restricted Option Shares held by Employee may be purchased by the Company at
the exercise price per share paid by Employee. If, pursuant to the Employment
Agreement, Employee's employment is terminated by the Company other than for
"cause"(as defined in the Employment Agreement) then this letter agreement shall
terminate and all restrictions contained in this letter agreement shall be of no
further force or effect.

         Employee agrees and consents to the entry of stop transfer instructions
with the Company's transfer agent against the transfer of any Restricted Option
Shares if such transfer would constitute a violation or breach of this
agreement.

<PAGE>

         Upon request, Employee will execute any additional documents necessary
in connection with enforcement of this letter agreement. Employee hereby
represents and warrants that he has full power and authority to enter into this
agreement. This letter agreement shall be binding on Employee and his
successors, heirs, personal representatives and assigns.

                                       Very truly yours,

                                       /s/ Amerisa Kornblum
                                       -----------------------------------------
                                       Amerisa Kornblum

                                       2<PAGE>
                                                                  Exhibit 10.5.8

                                 July 12, 2004

Odimo Incorporated
14001 NW 4th Street
Sunrise, Florida 33325

        Re:      RESTRICTIONS ON TRANSFER OF SHARES UNDERLYING STOCK OPTIONS

Ladies and Gentlemen:

         In March 2004, Odimo Incorporated granted to George Grous ("Employee")
the option to acquire 480,000 shares of the Company's Common Stock (the "Option
Shares") upon the terms and subject to the conditions of that certain Stock
Option Agreement dated March 1, 2004, a copy of which is attached hereto and
incorporated by reference into this letter agreement (the "Stock Option").

         Employee irrevocably agrees, for the benefit of the Company, that,
without the prior written consent of the Company, Employee will not (and will
not announce or disclose any intention to), directly or indirectly,

                  o        offer, sell, assign, transfer, pledge, encumber,
                           agree or contract to sell, grant an option to
                           purchase or enter into any transaction or device that
                           is designed to, or could reasonably be expected to,
                           result in the disposition by any person at any time
                           in the future of, or

                  o        enter into any swap, derivative or transaction or
                           other arrangement that transfers to another, in whole
                           or in part, any of the economic benefits or risks of
                           ownership of,

the Option Shares (the "Restricted Option Shares") in the amounts and during the
periods set forth below (the `Lock-Up Period"):

                               OPTION SHARES          LOCK-UP PERIOD
                               -------------          --------------
                                  160,000           3/1/04 to 2/28/05
                                  160,000           3/1/04 to 2/28/06
                                  -------
                                  320,000

Notwithstanding anything contained herein to the contrary, if pursuant to that
certain Employment Agreement dated July 12, 2004 between the Company and
Employee, Employee's employment is terminated by the Company for "cause" or
Employee resigns, any unexercised Stock Options shall terminate immediately, and
any Restricted Option Shares held by Employee may be purchased by the Company at
the exercise price per share paid by Employee. If, pursuant to the Employment
Agreement, Employee's employment is terminated by the Company other than for
"cause"(as defined in the Employment Agreement) then this letter agreement shall
terminate and all restrictions contained in this letter agreement shall be of no
further force or effect.

         Employee agrees and consents to the entry of stop transfer instructions
with the Company's transfer agent against the transfer of any Restricted Option
Shares if such transfer would constitute a violation or breach of this
agreement.

<PAGE>

         Upon request, Employee will execute any additional documents necessary
in connection with enforcement of this letter agreement. Employee hereby
represents and warrants that he has full power and authority to enter into this
agreement. This letter agreement shall be binding on Employee and his
successors, heirs, personal representatives and assigns.

                                       Very truly yours,

                                       /s/ George Grous
                                       -----------------------------------------
                                       George Grous

                                       2

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