The valuable blue form of corundum is called sapphire. Sapphire is a precious gemstone that is highly sought after for its stunning blue color and exceptional hardness. It belongs to the mineral species corundum, which is composed of aluminum oxide.

When it comes to gemstones, sapphire is known for its durability and brilliance. It ranks 9 on the Mohs scale of hardness, making it one of the hardest gemstones in the world, second only to diamond. This hardness ensures that sapphire is resistant to scratches and maintains its luster over time.

Sapphire is most commonly associated with the color blue, but it can actually be found in a range of hues, including yellow, pink, green, and even colorless. The blue variety, however, is the most highly prized and sought after. Its deep blue color is often described as mesmerizing and captivating.

One of the most famous sapphires in the world is the Star of India, which is currently housed in the American Museum of Natural History. This enormous blue star sapphire weighs a staggering 563.35 carats and is valued at millions of dollars. It is a true testament to the beauty and rarity of this gemstone.

Sapphire has been treasured for centuries and is often associated with royalty and wealth. In ancient times, it was believed to protect the wearer from harm and bring them good fortune. Today, sapphire continues to be a popular choice for engagement rings and other fine jewelry pieces.

When purchasing sapphire, it is important to consider factors such as color, clarity, cut, and carat weight. The most valuable sapphires exhibit a rich, vivid blue color, have excellent clarity, and are well-cut to maximize their brilliance.

In summary, the valuable blue form of corundum is called sapphire. Its stunning color, exceptional hardness, and association with royalty make it a highly sought after gemstone. Whether you're looking for a dazzling engagement ring or a beautiful piece of jewelry, sapphire is sure to make a lasting impression.

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