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Gem Resources International
Gem Resources
PO Box 62006
Minneapolis, MN 55426

Phone: (612) 664-0252
Toll-Free: (800) 588-8515
E-Mail: gri@gemresources.com
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Topaz London Blue

Natural London Blue Topaz

Refraction Index: 1.610 - 1.620
Hardness:  8
Specific Gravity:  3.53 - 3.56
Dispersion: 0.014
Treatment: Irradiated and heat-treated
Care: Wash with mild soap and water. Never steam or ultrasonically clean.

 
 
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