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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The fixing of the specific gravity of a stone also determines its group position with regard to weight; its colour and other characteristics defining the actual stone. This is a safe and very common method of proving a stone, since its specific gravity does not vary more than a point or so in different [...] |
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