For Gemologists Archive

For Gemologists

Asterism in Gems

Asterism in Gems by Nasrina Parvin Khan “Asterism” is an exclusive light effect (which we called special optical phenomenon) of some crystal. When light pass through these crystals, its …
For Gemologists


Labradorescence by Nasrina Parvin Khan Labradorescence is an exclusive optical phenomenon that has solely shown by the feldspar gem Labradorite in this earth. Iridescence flashes of colors, which appear …