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.

The wheel of metal companionality. Main metals are in the inner circle

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The unique Cobalt Blue Spinel from the legendary Luc Yen mine in Vietnam. , Why is the Cobalt Blue Spinel so desirable and hunted for by Gem

Cobalt Blue Spinel Vietnam 0.40 ct

Spinel: Red and blue gems confused with ruby and sapphire

BLUE SPLENDOR: watch the story of the BIGGEST COBALT BLUE SPINEL

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

Spinel Color and Magnetism, Blue Spinel and Cobalt Spinel

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

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Blue cobalt spinel from Vietnam - SSEF

Diamond - Wikipedia

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List of Blue Gemstones – Names, Meanings, & Interesting Facts — Fierce Lynx Designs