Group C. Stones whose specific gravity lies between 3.50 and under 3.70.
Pyrope (average) 3.682
Chrysoberyl 3.689 and occasionally to 3.752
Spinel 3.614 ” 3.654
Kyanite 3.609 ” 3.688
Hessonite 3.603 ” 3.651
Diamond 3.502 ” 3.564
Topaz 3.500 ” 3.520
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