Canada's most respected gemmological laboratory, Harold Weinstein Ltd., provides gemmological and jewellery-dependent services, including jewellery appraisals, (jewelry for our American clients), diamond grading, and gemstone evaluation and identification.

Since 1977 our gemmologists and appraisers have been providing professional expertise to major law firms, government agencies, insurance companies, national jewellery chains, international auction houses, fine independent jewellers and individual jewellery buyers. Antique and estate items are treated with the care and attention they deserve.

The links above on the navigation bar lead to pages where we explain about the 4 C's of diamond grading as well as all our jewellery services.

Our infrequent blog and gemmological/jewellery news can be found on the Lab Notes pages.

Our gemmological credentials can be found on the Credentials page.