25-11-2020
Gübelin Gem Lab has launched Gübelin Gemstone Rating, a point-based gemstone rating system to fill the absence of common method to describe the quality of a gemstone. The gemmological laboratory delicates to offer “orientation, more transparent information, and comparability for final customers as well as the entire industry.”
It examines three factors – quality, rarity and salience in a score out of 100. Quality evaluates the gemstone’s colour, clarity, transparency, cut and brilliance. Rarity includes the rareness of the gemstone in the market as well as its size and extent of treatments. Salience describes its uniqueness. Only gemstone that achieves 75 or above will receive a Gübelin Point rating.
The system is currently available for the gemstones below:
ruby
emerald
sapphire
padparadscha sapphire
tourmaline
spinel
alexandrite
aquamarine
garnet
tanzanite
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