Scientists figure out origin of cobalt-blue spinel in Canada's Arctic

Small spinel stones with good transparency and fine cobalt-blue colour can sell for about 10 times the price of a comparable sapphire.

Spinel: Mineral information, data and localities.

Sodalite - Wikipedia

Delicate Yellow Flower With Five Petals, Green Leaves In Blurred Background Stock Photo Alamy

Minerals SpringerLink

13 Gemmy Facts About Spinel - The Overlooked Gem

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Spinel: Mineral information, data and localities.

GIL Certified 1.79 Carat Cobalt Blue Natural Spinel from Burma Untreated For Sale at 1stDibs

Diamond - Wikipedia

Applied Sciences December-1 2023 - Browse Articles