Subject
Precious stones
Gems
5
Mineralogy
3
Precious stones Collection and preservation
2
Emblems, State
1
Emeralds
1
Feldspar
1
Fluorescence
1
Fossils
1
Medicine, Magic, mystic, and spagiric
1
Mineralogy, Determinative
1
Minerals
1
Mines and mineral resources
1
Pearls
1
Precious stones Therapeutic use
1
Quartz
1
Rocks
1
Rubies
1
Sapphires
1
Signs and symbols
1
Stegosaurus
1
Tourmaline
1
Uranium ores
1