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.

For over thirty five years our gemmologists 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.

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.