Mohs Scale of Gemstone Hardness

The Mohs Scale is commonly used to rate gemstone hardness. It’s very useful to know the hardness of the particular gemstone you’re working with so that you can design a mounting or piece of jewelry appropriate for it, resulting in a quality, durable piece...

BIRTHSTONES by Month

A handy chart for Birthstones by month (vs. Birthstones by Zodiac sign) by C&I.  Note that the stones for October, November & December are different from one chart to the other.
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