12 Pieces - Ruby (Corundum) crystal specimens in acrylic boxes

A flat of 12 Ruby crystals mounted in acrylic boxes using museum putty.
Each specimen is from India.

Corundum is the crystal form of Aluminum Oxide.
The trace element of Chromium gives Rubies their red color.
Rubies measure 9 on the MOHS scale of hardness.

The specimen boxes measure 1.25" wide x 1.25" deep x 1" tall.
Each specimen measures about 3/8" to 1/2".
Each specimen is significantly different from the next.

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