<PAGE>
                                                                   EXHIBIT 32.1


                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Lazare Kaplan International, Inc. (the
"Company") on Form 10-K for the period ended May 31, 2003 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, Leon
Tempelsman, Vice Chairman of the Board and President of the Company, certify,
pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that:

     (1)  The Report fully complies with the requirements of section 13(a) or
          15(d) of the Securities Exchange Act of 1934; and

     (2)  The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Company. A signed original of this written statement required
          by Section 906 has been provided to the Company and will be retained
          by the Company and furnished to the Securities and Exchange Commission
          or its staff upon request.

Dated: August 26, 2003


                                                   LEON TEMPELSMAN
                                                   -----------------------------
                                                   Leon Tempelsman
                                                   (Chief Executive Officer)






<PAGE>

                                                                   EXHIBIT 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Lazare Kaplan International, Inc. (the
"Company") on Form 10-K for the period ended May 31, 2003 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, William
H. Moryto, Vice President and Chief Financial Officer of the Company, certify,
pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that:

     (1)  The Report fully complies with the requirements of section 13(a) or
          15(d) of the Securities Exchange Act of 1934; and

     (2)  The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Company. A signed original of this written statement required
          by Section 906 has been provided to the Company and will be retained
          by the Company and furnished to the Securities and Exchange Commission
          or its staff upon request.

Dated: August 26, 2003


                                                   WILLIAM H. MORYTO
                                                   -----------------------------
                                                   William H. Moryto
                                                   (Chief Financial Officer)