Alphabetical
Gemstone List
Click
on a letter for a list of gems:
A| B| C| D| E| F| G| H| I| J| K| L| M| N| O| P| Q| R| S| T|U| V| W| X|Y |Z
Gemstones that begin
with the letter "I"
| Gemstone |
Crystal
System |
Density |
Hardness |
Refractive
index |
Treatments |
Idocrase
|
tetragonal
aggregate |
3.40 |
6.5 |
1.713-1.718 |
none |
Iolite
|
orthorhombic |
2.61 |
7.0-7.5 |
1.542-1.551 |
none |
Ivory
|
organic |
1.85 |
2.25-2.75 |
1.54 |
dying,
bleaching |
