Blue and light-blue spinel from Tanzania

Cobalt Blue spinel in oval cut 1.59 carats, Tanzania

Blue spinel in cushion cut 2.26 carats, Tanzania

Cobalt spinel cushion cut 1.00 carats, Tanzania

Cobalt spinel octagon cut 1.91 carats, Tanzania

Blue spinel cushion cut 9.10 carats, Tanzania

Blue spinel cushion cut 2.26 carats, Tanzania

Cobalt spinel cushion cut 2.06 carats, 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

Blue spinel in cushion cut 1.44 carats, Tanzania

Deep Blue spinel in cushion cut blue 1.67 carats, Tanzania

Cobalt blue spinel in cushion cut 2.05 carats, Tanzaniats,

Spinel cushion cut 1.59 carats, Tanzania

Cobalt blue spinel in oval cut 6.04 carats, Tanzania

Rare cobalt blue spinel in cushion cut 1.23 carats, Tanzania

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

Intense blue cobalt spinel in oval cut 1.08 carats, 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

Blue-violet spinel in oval cut 3.00 carats, Tanzania

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

Cushion-cut blue spinel 2.13 carats, Tanzania

Rare cobalt blue spinel in octagon cut 2.11 carats, Tanzania

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