Photographed from the GIA Collection for the CIBJO project. Moonstone feldspar from the Dr. Eduard J. Gubelin Collection. Left to right: light orange moonstone GIA collection# 33106, 8.28 ct, India; gray moonstone GIA collection# 33109, 15.24 ct, India; orange moonstone GIA collection# 33108, 10.55 ct, India; and light blue moonstone GIA collection# 33111, 8.74 ct, Sri Lanka.