Small spinel stones with good transparency and fine cobalt-blue colour can sell for about 10 times the price of a comparable sapphire.
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Metamorphosed carbonate platforms and controls on the genesis of sapphire, gem spinel, and lapis lazuli: Insight from the Lake Harbour Group, Nunavut, Canada and implications for gem exploration - ScienceDirect
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Scientists figure out origin of cobalt-blue spinel in Canada's
