Canada's foremost gemmological laboratory, Harold Weinstein Ltd., provides a variety of gemmological and jewellery related services, including jewellery appraisals, (jewelry for our American clients), diamond grading, and gemstone identification. See the Services area for complete details.
Our clients include major law firms, government agencies, national jewellery chains, international auction houses, fine independent jewellers and discerning individuals like you.
We'll explain the different types of jewellery appraisals available, give tips on jewellery buying, selling and insuring, as well as explain about the 4 C's of diamond grading and much more
The hand-held magnifier below, known as a jeweller's loupe is a gemmologist's most basic piece of equipment.

With it, we can look closely at the smallest details. Click on it to get a guided tour of HWL, up close and personal. Click on any of the coloured text areas on the left border to go directly to that section. The large "HW" on the top left of all following pages returns you here. We will add more info on a regular basis to help you learn about diamonds and other things gemmological. 

Visit the Lab Notes page to find out what's new in the Canadian Jewellery industry.

Synthetic Moissanite identification information can be found here.

The other pages (Insurance, Buy&Sell etc) are the opinions of HWL, not necessarily the trade in general. We did promise "up close and personal". We've added some detail to the Insurance page as well as some new links.

What's New

Latest update Jan. 2004.

If you have questions or comments about this web site or our services please phone us at: 416.366.6518.