|
Diamond |
| Chemical
composition: Pure carbon |
| Color: Colorless
to hues of brown, yellow, pink, chartreuse, blue, etc. The most
priced diamond are those classified as colorless and
"fancy" |
| Hardness:
10 |
| Density: 3.52 |
| Refractive
index: 2.417 |
| Occurrence: South
Africa, Angola, Botswana, Australia, Russia, India, Brazil,
Venezuela. |
|
|
White
Sapphire |
| Chemical
composition: Pure Al203 |
| Species:
Corundum |
| Color:
Colorless |
| Hardness:
9 |
| Density:
around
4 |
| Refractive
index: 1.762-1.770 |
| Birefringence:
0.008 |
| Occurrence:
Sri
Lanka, Burma, Thailand, Cambodia. |
|
