Exhibit 99.1

                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 Diomed Holdings, Inc. (the "Company") Quarterly Report on
Form 10-QSB for the quarter ended September 30, 2002, as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, Lisa
Bruneau, Principal 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 I have reviewed the Report and to the best of my knowledge:

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

          (2)  The information contained in the Report fairly presents, in all
               material respects, the financial condition and results of
               operations of the Company.

Date:    November 14, 2002               By:   /s/ Lisa M. Bruneau
                                               Lisa M. Bruneau
                                               Principal Financial Officer,
                                               Vice President, Finance,
                                               Secretary and Treasurer