Russian demantoid 3.98ct

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Origin - Elizavetinsky deposit, Tagil, Urals, Russia
Color - Vivid medium green
Clarity - Visible inclusion of byssolite fibers, but there is a excellent shine and color spark
Cut - Excellent
Not heated.
byssolite fibers have a brownish tint, this is limonite - hydrous iron oxide
when heated, it turns into a black anhydrous form - hematite