I knew Mark going back to a business he started in Laurel MD called the Golddust. He was a gem cutter, and gem dealer. The Golddust did everything gem related including goldsmithing, faceting and gem buying and selling, both rough and finished. One of the faceters who worked for him is the well known Virginia faceter, Tom Trozzo. He and I are perhaps the most knowledgeable on the subject of Mark. He was a smart, knowledgeable and colorful individual.
Michael D Cowing firstname.lastname@example.org