precious stones: Ruby

Rubies are a highly prized precious stone that are known for their deep red color, rarity, and beauty. In this article, we will explore the history, properties, and uses of rubies.


Rubies have been treasured for thousands of years. In ancient times, they were believed to have mystical powers and were used in many cultures for protection, healing, and spiritual ceremonies. The ancient Greeks believed that rubies could help preserve the body and mind, while the Hindus believed that they could bring success, wisdom, and peace.

In the Middle Ages, rubies were highly sought after by royalty and the wealthy. They were used in jewelry, crowns, and other adornments. The famous Timur Ruby, a large, red gemstone weighing over 350 carats, was one of the most valuable rubies in history and was owned by many prominent rulers and leaders throughout the centuries.


Rubies are a variety of the mineral corundum, which is an aluminum oxide. Their deep red color is caused by the presence of chromium within the crystal structure. The intensity of the color is determined by the amount of chromium present.

Rubies are a relatively hard stone, with a Mohs hardness rating of 9 out of 10. They are not as hard as diamonds, but they are still very durable and resistant to scratches and damage. Rubies also have a high refractive index, which gives them a beautiful sparkle and shine.


The most common use of rubies is in jewelry. They are often used in engagement rings, earrings, necklaces, and bracelets. They are also used in watches and other accessories. Rubies are often paired with diamonds, as their colors complement each other well.

In addition to their use in jewelry, rubies are also used in industry. They are used as bearings in watches and other precision instruments. They are also used in lasers, as their ability to absorb and emit light makes them ideal for this application.


Rubies are a beautiful and highly valued precious stone. They have been treasured for thousands of years for their deep red color, rarity, and mystical properties. Whether used in jewelry or in industrial applications, rubies are a testament to the enduring appeal of precious stones and their ability to captivate and inspire us.