Sapphire is a precious gemstone (a type of corundum) that ranges in color from blue to pink to yellow to green to white to purple (mauve sapphire) to pink-orange (padparadscha sapphire). Sapphire comes from the Greek word for blue, sappheiros , and this gem provides the most beautiful blues of the gem kingdom. The ancient Persians believed the earth rests on a giant sapphire. Its reflection, they said, made the sky blue. Sapphire, the celestial gemstone, has been treasured for thousands of years. Sapphire is perhaps the toughest and most durable gemstone available on the market. Since sapphire symbolizes sincerity and faithfulness, it is an excellent choice for an engagement ring.