Sapphires are One of the Four Precious Gemstones. The terms stones and gemstones are thrown around quite a bit, but for the most part, while almost all gemstones originate from some mineral (besides rare exceptions like pearls), not every stone is a gemstone, which is used almost interchangeably with the term precious. This is because some are considered more memorable than others and only a select few are in the category of precious gemstones.
To be clear, the separation between precious and semi-precious is no longer used—still, many differences between the two groups.
A stone becomes a gem once it has been transformed from its rough mineral form into a cut and polished jewel. The most lavish gemstones on the planet, diamonds, emeralds, rubies, and sapphires, fall into what was called precious gemstones. All other gemstones are referred to as semi-precious. Some are far less valuable than precious gemstones while others can cost quite a pretty penny.
Sapphires are the gemstone variety of the corundum mineral. The red sapphire variety is called a ruby. Sapphires are mined, and they are also manufactured for decorative purposes. These stones measure 9 on the Mohs scale in hardness, making them the third hardest gemstone after diamonds and moissanite respectively. Diamonds rank 10 whereas moissanite ranks 9.5. They are therefore also used for non-decorative uses such as infrared optical components.Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. The name sapphire is derived from the Latin “saphirus” and the Greek “sapheiros”, both of which mean blue.