Gadolinium Gallium Garnet. A synthetic gemstone used as an early diamond substitute. GGG is manufactured by the Czochralski method and can be manufactured in many colors. With its specific gravity of 7.5, it is a lot denser than a diamond while being a lot softer (6.5 – 7.5 on Mohs scale).

Gemological Information for Gadolinium Gallium Garnet (GGG)

Color:Colorless to Light Brown or Yellow
Crystal Structure:Cubic
Refractive Index:1.970(+.060)
Durability:Fair to Good
Similar Stones:GGG can be confused with: Diamond, Zircon, Strontium Titanate, Sphene, CZ & YAG. SG, Spectrum, Magnification, and Dispersion can be used to separate GGG from other similar material.
Country of Origin:Man-Made Material

Gadolinium Gallium Garnet (GGG) Care

Ultrasonic Cleaning:Safe
Steam Cleaning:Safe
Warm Soapy Water:Safe
Chemical Attack:Not Attacked
Light Sensitivity:Turns Brown Slowly with UV Light Exposure
Heat Sensitivity:Not Sensitive
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