Liquid solutions to gemstones | Crystal and stones

Garnets to Malachite

Group A. Isolates gems with a specific gravity of 4.7963 and over 4.70; in this group is placed zircon, with a specific gravity of from 4.70 to 4.88.

Group B. Stones whose specific gravity lies between 3.70 and under 4.7963.

Garnets, many varieties. Almandine 4.11 and occasionally to 4.25 Ruby 4.073 ” 4.080 Sapphire 4.049 [...]

Beginning then with the pure double nitrate of silver and thallium, this will isolate the stones of less specific gravity than 4.7963, and taking the lighter solutions and standardising them, we may get seven solutions which will isolate the stones as follows:

A shows the stones which have a specific gravity over 4.7963 B ” [...]