Ruby red gemstone

Ruby is a red variety of corundum, renowned for its hardness and vibrant color, making it one of the most valuable gemstones in the world.

About this subject

Ruby is one of the four most important precious gemstones, alongside diamond, emerald, and sapphire. Chemically, it is a form of aluminum oxide (Al₂O₃) with chromium impurities that give it its characteristic red color. This color can range from pink to deep blood-red, with the shade known as 'pigeon blood' being the most prized. Its hardness on the Mohs scale is 9, second only to diamond, making it very resistant to wear. Major ruby deposits are found in Myanmar (formerly Burma), Thailand, Sri Lanka, Mozambique, and Madagascar. Burmese rubies, especially from the Mogok region, are legendary for their quality. Historically, rubies symbolize passion, protection, and prosperity, used by kings and emperors. In the Middle Ages, they were believed to bring health and ward off evil thoughts. Natural rubies with rutile inclusions can exhibit asterism, forming six-ray stars. Today, synthetic rubies are produced in laboratories and used in jewelry and technological applications, such as lasers. Distinguishing natural from synthetic requires gemological analysis.

Frequently Asked Questions

What gives ruby its red color?

The red color of ruby is caused by the presence of chromium in the corundum crystal structure. The amount of chromium determines the intensity of the red, ranging from pink to blood-red.

Where are the finest quality rubies found?

The finest quality rubies traditionally come from Myanmar, especially the Mogok region. Other important sources include Mozambique, Thailand, and Sri Lanka.

What is the difference between natural and synthetic ruby?

Natural rubies are formed by geological processes over millions of years, while synthetic rubies are produced in laboratories using methods like flame fusion. Distinguishing them requires analysis of inclusions and optical properties by a gemologist.