Sapphire (noun)

1. A precious stone that is typically blue and is a variety of the mineral corundum.
2. A deep blue color.

Origin:

Middle english saphir, from old french, from latin sapphirus, from greek sappheiros.

Examples:

1. She wore a sapphire ring on her finger.
2. The sapphire necklace was a family heirloom.
3. The sapphire mines in Sri Lanka are famous.
4. The sky was a deep sapphire blue.
5. He had sapphire eyes.