Blue Spinels

Explore the spinels described as blue in our current listings, including the cobalt-labelled stones. Compare the actual photographs, cuts, measurements and carat weights to choose a stone for your collection or jewellery project.

Ask about treatment disclosure and available laboratory information for the individual stone. A blue appearance alone does not establish cobalt content; review the supporting documentation before relying on that designation. Enquire about a stone, or browse all spinels.

Find your colour.

Browse the colours described in our listings. Cobalt listings also appear under Blue; colour alone does not verify cobalt content.

9 products

6.71ct Natural Cobalt Spinel 6.71 ct Spinel — Cushion Cut — listing image 3

6.71ct Natural Cobalt Spinel | Massive Tanzanian Cushion | Untreated COBS27

$16,675.00
$16,675.00
2.31ct Natural Cobalt Spinel2.31ct Natural Cobalt Spinel | Flawless Blue Tanzanian Oval Cut COBS26

2.31ct Natural Cobalt Spinel | Flawless Blue Tanzanian Oval Cut COBS26

$8,337.00
$8,337.00
2.10ct Natural Blue Burmese Spinel2.10ct Natural Blue Burmese Spinel – VVS Pear Cut Untreated Gem COBS21

2.10ct Natural Blue Burmese Spinel – VVS Pear Cut Untreated Gem COBS21

$1,667.00
$1,667.00
2.15 ct Spinel — Oval Cut — listing image 1

2.15ct Natural Blue Burmese Spinel – Untreated Oval Cut Gemstone COB16

$1,667.00
$1,667.00
1.12 ct Spinel — Cushion Cut — listing image 11.12ct Natural Mahenge Cobalt Spinel – Royal Blue Cushion Gemstone COBS16

1.12ct Natural Mahenge Cobalt Spinel – Royal Blue Cushion Gemstone COBS16

$1,025.00
$1,025.00
0.98 ct Spinel — Cushion Cut — listing image 10.98ct Natural Mahenge Cobalt Blue Spinel – Rare Cushion Cut Gem COBS15

0.98ct Natural Mahenge Cobalt Blue Spinel – Rare Cushion Cut Gem COBS15

$1,155.00
$1,155.00
2.15 ct Spinel — Oval Cut — listing image 12.15ct Natural Blue Burmese Spinel – Untreated Oval Cut Gemstone COBS13

2.15ct Natural Blue Burmese Spinel – Untreated Oval Cut Gemstone COBS13

$1,667.00
$1,667.00
1.32ct Royal Blue Mahenge Spinel Rare 1.32ct Royal Blue Mahenge Spinel – VVS Cobalt Gemstone COBS8

Rare 1.32ct Royal Blue Mahenge Spinel – VVS Cobalt Gemstone COBS8

$1,501.00
$1,501.00
Vietnam Cobalt Spinel Rare color

2.08ct Natural Vietnam Cobalt Spinel - Loupe Clean Emerald Cut - COBS 01

$9,621.00
$9,621.00