Stones/Gems with O
- Obsidian
- Ore
- Oro
- Oracle
- Olive
- opaque
- Ores
- Opale
- Olivine
- Osmium
- ornament
- orange calcite
- Old
- octopus
- Oynx
- Oxford
- One
- Oval stone
- Orchid
- Opalo
- One stone
The words in the list Stones/Gems with O come from players of the word game Categories game.