Simple categories matching colorless:

• gemstone,
• mineral,
• stone,
• substance,
• gem,

Members with property colorless:

• diamond,
• borax,
• colorless_sapphire,
• white_topaz,
• quartz,
• gypsum,
• topaz,
• sapphire,
• calcite,
• opal,
• moonstone,
• aragonite,
• barite,
• silver_topaz,
• chalk,
• white_sapphire,
• kaolin,
• feldspar,