Unheated Umba Sapphires from Tanzania’s Umba Valley in a remarkable range of natural colors. Umba material is generally not heated because it tends not to respond well to treatment—and with colors like these, there is little reason to anyway.
large parcel of sapphires that will cut many fine gemstones
76 pieces / 50.143 grams / 250.715 carats / 3.29+ carats average / AA+ grade (90+%)
Estimate: $3750 - $4000
