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Sapphire is a precious gemstone, a type of corundum, known for its diverse range of colors, with blue being the most well-known. While typically blue, sapphires can be found in nearly any color except red, which is classified as a ruby. The name "sapphire" comes from the Greek word "sappheiros," meaning "blue stone".

Here's a more detailed description:

Corundum:

Sapphires are a variety of the mineral corundum, which is composed primarily of aluminum oxide (α-Al2O3).

Color:

Blue is the most common color of sapphire, but they can also be found in yellow, orange, purple, green, and other colors, often referred to as "fancy" sapphires.

Trace Elements:

The color of a sapphire is influenced by trace amounts of elements like iron, titanium, chromium, vanadium, and cobalt.

"Parti" Sapphires:

Some sapphires exhibit two or more colors, and these are known as "parti sapphires".

Durability:

Sapphires are known for their high hardness, ranking 9 on the Mohs scale, making them very durable and suitable for jewelry.

Uses:

Sapphires are prized for their beauty and durability and are used in a variety of jewelry, including rings, necklaces, and bracelets. They are also used in industrial applications, such as jewel bearings and abrasives.