Blue and light-blue spinel from Tanzania

Cobalt blue spinel in cushion cut 4.03 carats, Tanzania

Rare cobalt blue spinel in cushion cut 2.03 carats, Tanzania

Octagon-cut deep blue spinel 3.29 carats, Tanzania

Cushion-cut deeep blue spinel 5.90 carats, Tanzania

Rare cobalt blue spinel in cushion cut 1.23 carats, Tanzania

Blue-violet spinel in oval cut 3.00 carats, Tanzania

Cushion-cut blue spinel 2.13 carats, Tanzania

Intense blue cobalt spinel in oval cut 1.08 carats, Tanzania

Lavender purple spinel in heart shape 4.41 ct, Tanzania

Rare cobalt blue spinel in cushion cut 3.94 carats, Tanzania

Set of blue-purple spinel from Tanzania 3.60 ct

Cushion cut lavender purple spinel 8.01 ct, Tanzania

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

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

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

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 2.45 carats, Tanzania

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

Rare cobalt blue spinel in octagon cut 2.11 carats, Tanzania

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

Octagon-cut cobalt blue spinel 1.05 carats, Tanzania

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

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

Blue oval cut spinel 1.16 ct, Tanzania

Octagon cut cobalt blue spinel 1.35 ct, Tanzania

Cobalt blue spinel from Tanzania 3.51 ct

Unique octagon cut cobalt spinel 1.65 ct, Tanzania

Heart cut blue spinel 3.36 ct, Tanzania