Way of the Ultra Arky How to machine stone like the ancient builders. Coral fossilized by chalcedony is piezoelectric. If you are serious about learning the ancient art of ultrasonic rock machining, please do not bother jewelers as they do not use these high-speed stone carving machines. Most jewelers are salespeople offering other artist work, […]
Gemology, Jewelry, and Ancient Lapidary Read More »