Diamond Expertise.
From Rough to Refined.
Diamond cutting, repair, consulting, and rough and polished diamond trading for jewellery professionals. Based in Toronto. Serving trade clients across Canada.
Contact G&GExplore ServicesEvery Stage. One Specialist.
From evaluating rough stones to the final polish, Gennadi handles the cutting process personally — a breadth of expertise that allows clients to work directly with the person doing the work.
From Rough Stone
to Finished Diamond
See a real diamond project completed by Gennadi Yanovski — from evaluating the original stone and planning its cut to precision work at the cutting table and the finished result.
Each stone requires its own approach. This brief look at the process shows the technical judgment and hands-on experience behind the finished diamond.
What We Do
Diamond Buying & Selling
Buying and selling rough and polished diamonds for professional trade clients.
Diamond Cutting
Cutting rough stones through to the finished diamond.
Diamond Repair
Assessment and repair of damaged diamonds, including recutting where appropriate.
Polishing
Finishing and polishing for a refined result.
Rough Diamond Assessment & Consulting
Sorting and evaluating rough stones, with practical advice on cutting decisions.
Trade Enquiries Across Canada
Out-of-town clients arrange their own shipping after discussing the work with G&G.
Meet Gennadi Yanovski
Gennadi completed his education in gemology and diamond cutting in 1990. More than three decades later, he continues to work personally with jewellery stores, diamond dealers and wholesalers. His knowledge spans rough stone evaluation, cutting, finishing and repair — allowing clients to discuss their requirements directly with an experienced cutter.
Working With G&G
We work exclusively with jewellery businesses, diamond dealers and wholesalers. New trade enquiries are welcome. Meetings in Toronto are by appointment; clients arranging shipments should contact us first.
Start a Conversation
Discuss a stone, request a consultation, or enquire about buying and selling rough or polished diamonds. Contact Gennadi directly by phone or email.
Email G&GMaster Diamond Cutter
Office visits by appointment only. Address provided when arrangements are confirmed.