Global Gemstone Certification
Emerald
Emerald
The name of this gemstone is derived from ‘smaragdus.’ In Greek this simply means green and it is another variety of beryl. It is largely considered to be the most valuable gemstone which is green in color. Similar to diamonds, this is due to it being incredibly durable and quite rare. It’s worth noting that the pale variety of this stone does not receive the name emerald. Instead, they are referred to as ‘green beryl.’ They can be heat-treated which causes the stone to transform into aquamarine. Emeralds will commonly have a variety of inclusions as well as fissures that may break the surface.
Chemical Formula |
Be3Al2SiO6 |
Color |
Green |
Hardness |
7.5 – 8 |
Crystal System |
Hexagonal |
Refractive Index |
1.57 – 1.58 |
SG |
2.6 – 2.8 |
Transparency |
Transparent to translucent |
Double Refraction |
.006 |
Luster |
Vitreous |
Cleavage |
3,1 – basal |
Mineral Class |
Beryl (Emerald) |