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

Derived forms: ruby spinels

Type of: spinel

• Pteridospermaphyta
• Pteridospermopsida
• Pteriidae
• pterion
• Pteris
• Pteris cretica
• Pteris multifida
• Pteris serrulata
• Pternohyla
• Pternohyla fodiens
• ptero-
• Pterocarpus
• Pterocarpus angolensis
• Pterocarpus indicus
• Pterocarpus macrocarpus
• Pterocarpus marsupium
• Pterocarpus santalinus
• Pterocarya
• Pterocarya fraxinifolia
• Pterocles
• Pterocles alchata
• Pterocles indicus
• Pteroclididae
• Pterocnemia
• Pterocnemia pennata