“6.7 x 5.2 x 3.0 cm. Sharp, lustrous, rich emerald green trigonal prisms of dioptase measuring up to 1.3 cm line the interior of this attractive small cabinet specimen. Ex Kay Robertson Collection (#12487). Kay is a prominent California collector, who specialized in European classics (see the article in the March-April, 2007 Mineralogical Record). ”

“6.7 x 5.2 x 3.0 cm. Sharp, lustrous, rich emerald green trigonal prisms of dioptase measuring up to 1.3 cm line the interior of this attractive small cabinet specimen. Ex Kay Robertson Collection (#12487). Kay is a prominent California collector, who specialized in European classics (see the article in the March-April, 2007 Mineralogical Record). ”