1. A spinel used as a gemstone (usually dark red)
   - spinel ruby

Derived forms: ruby spinels

Type of: spinel

• cochlea
• caudated
• caudex
• Caudine Forks
• caudle
• caught short
• caught up
• caul
• cauldron
• caulescent
• cauliflower
• cauliflower ear
• cauline
• caulk
• caulked
• caulking
• Caulophyllum
• Caulophyllum thalictrioides
• Caulophyllum thalictroides
• causa
• causal
• causal agency
• causal agent
• causal factor
• causalgia