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  three  months  ended  March  31,  2003 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 represents, in all material
     respects, the financial condition and results of operations of the Company.

Date: May 15, 2003 By:         /s/ LISA M. BRUNEAU
                               Lisa M. Bruneau
                               Principal Financial Officer
                               Vice President, Finance
                               Secretary and Treasurer


A  SIGNED  ORIGINAL  OF  THIS WRITTEN STATEMENT REQUIRED BY SECTION 906 HAS BEEN
PROVIDED  TO DIOMED HOLDINGS, INC. AND WILL BE RETAINED BY DIOMED HOLDINGS, INC.
AND  FURNISHED  TO  THE  SECURITIES  AND  EXCHANGE  COMMISSION OR ITS STAFF UPON
REQUEST.