Table of Hardness of Gems

A table of the hardness of the principal gems and precious stones, including the diamond, sapphire, chysoberyl, topaz, emerald, garnet, amethyst, peridot, opal, and lapis-lazuli

TABLE OF HARDNESS OF THE PRINCIPAL GEM-STONES

10.- Diamond.

9 1/2.- (Carborundum.)

9.- Sapphire and ruby (also all the color varieties of sapphire).

8 1/2.- Chrysoberyl (alexandrite).

8.- True topaz and spinel (rubicelle, balas ruby).

7 1/2.- Emerald, aquamarine, beryl, Morganite, zircon (jacinth and true hyacinth and jargoon), almandine garnet.

7 1/4.- Pyrope garnet (Arizona ruby, cape ruby), hessonite garnet (cinnamon stone), tourmaline (various colors vary from 7 to 7 1/2), kunzite (7+)

7.- Amethyst, various quartz gems, quartz "topaz," jade (jadeite).

6 1/2.- Peridot (chrysolite), demantoid garnet ("olivine"), jade (nephrite).

6.- Opal, moonstone, turquoise.

5.- Lapis lazuli.


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