About the International Gem Society (IGS)
…Come join our community! About the Founder Posing with some Quartz Donald Clark, CSM founded the International Gem Society in 1998. Donald…
…Come join our community! About the Founder Posing with some Quartz Donald Clark, CSM founded the International Gem Society in 1998. Donald…
Donald Clark, CSM, posing with some Quartz The International Gem Society (“IGS”) was founded by Donald Clark, CSM with the mission…
…afraid I would swap it with a lower-quality stone. How many 5-ct, heart-shaped diamonds do you think I kept in stock? Donald Clark, CSM IMG Repair…
…provide an affordable education in gemology. IGS’s founder — Donald Clark, CSM IMG — created a robust testing process…
…(brown). Comments by Don Clark, CSM IMG Feldspars are our most common mineral, making up over 99% of the earth’s crust. Their formation…
…full of invisible inclusions that leave them a bit less than fully transparent. Donald Clark, CSM IMG Follow-Up Questions Thanks for the information.…
…list was compiled from information provided by Donald Clark, CSM IMG, Dr. Gerald Wykoff, Dr. Clive Washington, Roy Kersey, and others. Vegetable…
…gem shows listed at the end of Mr. Clark’s article for exact locations, dates, and times. By Donald Clark, CSM IMG 7 minute read These crystals…
…now discontinued, this microscope occasionally appears for sale at resale shops and online marketplaces like eBay. This review may prove…