Semi-Precious Stones
Semi-precious is a trade term for gem materials outside the classic four of diamond, ruby, sapphire and emerald. These stones are widely sold as tumbled stones, beads and cabochons, which also makes them the most frequently imitated with dyed or glass look-alikes.
Mohs hardness in this group runs from 5.5 to 8.
All semi-precious stones (13)
Frequently asked questions
What are the most common semi-precious stones?
The most searched semi-precious stones in the StoneSnap database are Opal, Tanzanite, Turquoise, Lapis Lazuli, and Moonstone.
How do you identify semi-precious stones?
Start with luster and color, then bracket the Mohs hardness with a scratch test and check the streak on unglazed porcelain. Mohs hardness in this group runs from 5.5 to 8. Each entry below lists the diagnostic properties and its common look-alikes.
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