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.

Be aware that an individual or group of individuals is working within the jewellery industry using the name Harry Weinstein Group or Harry Weinstein Associates. This involves the selling and buying of gemstones for investment.

This individual or group of individuals has no association with and is unknown to Harold Weinstein Ltd. Any and all documentation of any sort prepared by this individual or group of individuals has no relationship with Harold Weinstein Ltd.