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Stones and pickle, ultrasonic, heating, etc

Yesterday I posted that a company called “Spectral Gems” used to
publish a nice plastic coated sheet of on how various
common gemstones tolerate heat, pickling, ultrasonics, etc. I didn’t
have the address at the time but here it is. These people have a
pretty good selection of stones, a nice looking catalog, good for the
showroom with triple key pricing, etc. I find their prices a bit
high, but often resort to them when I’m looking for something

Spectral Gems, Inc.
P.O. Box 12303
Birmingham, MI  USA
(313) 644-2488
Toll Free: 1-800-637-4367

Ask them about their “Gemstone Characteristics and Durability Guide”.

David L. Huffman