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 specefic gravity og 7,5 it is a lot denser then 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
Hardness: 6.5
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.
Treatments: None
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