Marlborough (Imperial Green) Chalcedony, 16.89 ct. Cabochon, Master cut, Authentic

Marlborough Imperial Green Chalcedony, 16.89 ct. Cabochon, Master cut Shape - LARGE High Quality, High Dome base, small bevel at base for professional mounting..  Weight - 16.89 carat Size - 16 x 16 x 8.5 mm Color - Apple Green with expected slight blue hue inherent to Marlborough discovery 1970’s. Long mined out this is the real thing.  Clarity - Translucent Luster - Exceptional Origin - Marlborough Australia Treatment - None  Hardness - 7 Notes - THIS GEM IS MINED OUT. Google the name of this gem (Green Chalcedony Van Cleef & Arpels on a major auction site) Primarily mined out by large jewelry houses, (like the aforementioned), it was in such huge demand  Marlborough green chalcedony / chrysoprase was wiped out by the high-end jewelry industry and collectors especially Van Cleef & Arpels and China in the 1970's due to it being a dead ringer for the highest-end jadeite (Imperial to Apple Green) hardness is excellent and pieces of this vintage jewelry even with conservative a