Are all sapphires heat treated?

Are heat treated sapphires worth less?

Heating is an accepted treatment for sapphire. But for fine-quality sapphire, confirmation from an independent laboratory like GIA that there is no evidence of heat adds to a sapphire’s rarity and value.

Which gemstones are not treated?

Natural gemstones form within the earth. Stones such as Moonstone and Rose Quartz are typically not treated. However, some natural stones—like Amethyst, Topaz, Citrine, Sapphire, Ruby, Aquamarine, and Tanzanite—are usually heated after they’re recovered from the earth.

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