1. a precious red gemstone
2. a deep red color

1. having a deep red color

Examples

• She wore a beautiful ruby necklace to the party.
• The ruby in her engagement ring sparkled in the sunlight.
• The sunset painted the sky a brilliant ruby red.
• Ruby gemstones are among the most valuable precious stones.
• Her ruby lips stood out against her pale skin.
• The wine had a rich ruby color in the glass.