Orange sapphires are relatively rare compared to other colors of sapphire such as blue, pink, and yellow. This is because orange sapphires are typically found in only a few locations around the world, including Tanzania, Madagascar, Sri Lanka, and Australia. Additionally, the color of the sapphire can vary depending on the location, with some orange sapphires having a pinkish or reddish hue.

The rarity of an orange sapphire also depends on the size and quality of the stone. Large, high-quality orange sapphires are very rare and can command high prices in the gemstone market. In general, the rarer the color and the higher the quality of the stone, the more valuable the sapphire will be.

There are several famous orange sapphires, including:

1. The Orange Sapphire Tiara: This tiara was made in the early 20th century and features a series of large, oval-shaped orange sapphires surrounded by diamonds. It was owned by Queen Elizabeth the Queen Mother and is now part of the British Crown Jewels.

2. The Star of Adam: This is a large orange sapphire that was discovered in Sri Lanka in 2015. It weighs 1,404 carats and is one of the largest gem-quality sapphires ever found. The Star of Adam is named after a mountain in Sri Lanka and is currently owned by a private collector.

3. The Kentuckiana Pride Sapphire: This is a 9.43-carat orange sapphire that was discovered in Kentucky in the 1950s. It is one of the largest and finest orange sapphires ever found in the United States and is currently owned by the Kentucky Geological Survey.