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Demantoid is a relatively-rare gem found only in chromite, which itself is only found in olivine.
In the real world
Demantoids are effectively a variant of garnet, with the green and yellow colours a result of chromium and ferric iron (iron in the 3+ oxidation state).
This is a well-crafted brass amulet, studded with demantoid.
green garnet found with chromium ores
[SOLID_DENSITY:3900] Common to garnets. Range is 3500 - 4300