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 "J"
| Gemstone |
Crystal
System |
Density |
Hardness |
Refractive
index |
Treatments |
 Jadeite
|
microcrystalline |
3.34 |
6.5-7.0 |
1.660-1.680 |
dying |
 Jasper
|
micrcrystalline |
2.65 |
7.0 |
1.564-1.660 |
none |
 Jet
|
amorphous |
1.32 |
2.5-4.0 |
1.660 |
none |
