Sapphire
A variety of the mineral corundum, sapphire occurs in a wide range of colors – blue, pink, peach, yellow, green, purple, and orange. The only color sapphire cannot have is red: a red sapphire is classified as a ruby
Sapphire is rated 9 on the Mohs scale, making it the hardest gem among all natural gemstones - second only to diamond (diamond scores a 10, making it the hardest known mineral). Because of its amazing color selection and excellent hardness, sapphires have been one of the most popular engagement ring options of all time. Princess Diana’s sapphire engagement ring (now Kate Middleton) being the most well-known sapphire ring. Sapphire is the birthstone of September and is also used to commemorate the first, 23rd, and 45th anniversaries.
Kashmir, Burma, and Sri Lanka generally produce the highest quality sapphires, but Australia, Thailand, Madagascar, and North America (mostly Montana) also produce great quantities.
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