Cobalt Blue Spinel

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Cobalt blue spinel in octagon cut 1.41 ct, Tanzania photo
Cobalt blue spinel from Tanzania 0.77 ct photo
Cobalt blue spinel from Tanzania 3.51 ct photo
Cobalt blue spinel 2.45 carats, Tanzania photo
Extremely rare cobalt spinel 0.51 ct, Vietnam, Lotus photo
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