Birefringence
The difference between a doubly-refracting gem's two refractive indices. Diaspore's is about 0.048 — high enough to see doubling of back facets in larger stones.
The difference between a doubly-refracting gem's two refractive indices. Diaspore's is about 0.048 — high enough to see doubling of back facets in larger stones.
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