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cobalt-blue gemstone

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4.76 ct “Cobalt Blue”_Unheated Cobalt Blue Spinel

Cobalt Blue, Elongated Cushion, Spinel

$21,600

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0.99 ct “Congo Cobalt”_Unheated Blue Spinel

Cobalt Blue, Oval, Spinel

$1,710

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7.42 ct “Cobalt Azure”_Unheated Blue Spinel

Cobalt Blue, Cushion, Spinel

$37,800

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6.05 ct “The Loyalty Cobalt”_Unheated Cobalt Blue Spinel_GRS Certified

Blue, Cushion, Spinel

$42,500

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3.49 ct “Romance Blue”_Unheated Tanzania Blue Spinel_ Brilliant Cushion

Blue, Cushion, Spinel

$1,390

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3.34 ct “Cerulean Teal”_Unheated Tanzania Blue Spinel

Blue, Cushion, Spinel

$1,350

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6.83 ct “Two Gentle Flames”_Unheated Tanzania Blue Spinel_ Brilliant Cushion

Blue, Cushion, Spinel

$3,150

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4.55 ct “Chameleon Glow”_Unheated Tanzania Blue Spinel_ Brilliant Cushion

Blue, Cushion, Spinel

$3,150

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4.71 ct “Midnight Azure”_Unheated Tanzania Spinel

Blue, Cushion, Spinel

$2,700

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