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Welcome to Global Gem Testing Laboratory

Global Gem Testing Laboratory Co., Ltd (GGT) is a private, independent gemological laboratory. We provide reliable and accurate gemological testing services. Our quality reports are certified by experienced professional gemologists.

GGT Service

- Distinguishing natural, synthetic and imitation gemstones.
- Analyzing the enhancement in gemstones.
- Distinguishing natural diamond and diamond simulant.
- Analyzing gemstones by advanced instruments.
- Grading diamond clarity and color.
 
GGT GUIDE TO RUBY COLOR

“Pigeon’s blood red” is a vivid red color (high saturation), with medium to medium-deep tone. A minute purplish tint is acceptable. Rubies exhibit medium to strong fluorescence when exposed to UV light.

TRANSPARENT RHODONITE WITH UNUSUAL INCLUSIONS

Most Rhodonite seen in the trade are translucent to opaque pink, often with black veins or spots. Many are fashioned into beads and cabochons. However, transparent Rhodonite is also found in some localities.

INTERESTING INCLUSIONS IN QUARTZ CRYSTAL

The quartz crystal from Himalaya Mountain in Pakistan-Afghanistan area contains many yellow fluid filled pockets with free moving gas bubble inside.

Rhodolite Garnet



Synthetic bi-colored quartz



Dyed Quartz



Synthetic Ruby (flux)



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