Cobalt Blue Spinel

Beyond rare vietnamese cobalt blue spinel in cushion cut 1.58 carats, Luc Yen

Unique collector's cobalt spinel with Electric blue color in oval cut 7.10 carats, Tanzania

Cobalt blue spinel in cushion cut 3.02 carats, Tanzania

Octagon-cut cobalt blue spinel 1.05 carats, Tanzania

Unique GRS type Peacok blue cobalt spinel in oval cut 1.52 carats, Tanzania

Rare cobalt blue spinel in octagon cut 2.11 carats, Tanzania

Pair of electric blue cobalt spinels in octagon cut 2.11ct, Tanzania

Super rare Mahenge cobalt blue spinel in oval cut 3.02 carats, Tanzania

Rare cobalt blue spinel in cushion cut 3.94 carats, Tanzania

Unique cobalt blue cushion cut spinel from Tanzania 7.08 ct, GRS

Extremely rare cobalt spinel 0.51 ct, Vietnam, Lotus

Rare electric blue cobalt spinel from Tanzania in oval cut 5.34 ct

Cobalt blue spinel 1.47 ct in octagon cut from Tanzania

Cobalt blue spinel in ascher cut 0.92 carats, Tanzania

Сobalt blue spinel in octagon cut 1.01 ct from Tanzania

Cobalt blue spinel from Tanzania 3.51 ct

Cobalt blue spinel 2.45 carats, Tanzania

Cobalt blue spinel in octagon cut from Tanzania 1.49 carats

Set of cobalt blue spinels in pear cut 2.02 carats, Tanzania

Blue cobalt cushion cut spinel 1.50 carats, Tanzania

Intense cobalt spinel in radiant cut 1.12 ct, Tanzania

Octagon cut cobalt blue spinel 1.35 ct, Tanzania

Unique octagon cut cobalt spinel 1.65 ct, Tanzania