6/29/2023 0 Comments Ruby and sapphire stonePhysical and chemical propertiesīoth rubies and sapphires are varieties of the corundum family of gemstones, meaning they are dense and compact, and are the second hardest natural mineral, with diamonds being the hardest. Most people are familiar with diamonds, but how well do you know the other three gems? Here, I have put together some information on the technical aspects of rubies, sapphires and emeralds. There are only four precious stones – diamond, ruby, sapphire and emerald – and all other gemstones are known as semi-precious. When we talk about gemstones, you may be familiar with the terms precious and semi-precious stones.
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