Sapphire blue gemstone

Blue sapphire is a variety of corundum, renowned for its hardness and intense color, making it one of the most valued gemstones worldwide.

About this subject

Blue sapphire belongs to the corundum family, a mineral composed of crystallized aluminum oxide. With a hardness of 9 on the Mohs scale, it is second only to diamond in scratch resistance. Its characteristic blue color comes from the presence of titanium and iron in its crystal structure. When corundum exhibits a red color, it is called ruby; all other colors are termed sapphires, with blue being the most famous.

Major deposits of blue sapphire are found in Sri Lanka (formerly Ceylon), Myanmar (Burma), Kashmir (India), and Madagascar. Kashmir sapphires, with their velvety and intense hue, are considered the finest, but the mines are nearly depleted. Sri Lanka produces a wide range of colors and is known for high-clarity sapphires. Madagascar has become a significant source of quality gems since the 1990s.

Historically, blue sapphire symbolizes nobility and fidelity. Princess Diana's engagement ring, now worn by Kate Middleton, features a 12-carat blue sapphire surrounded by diamonds. Another famous gem is the Star of India, a 563-carat star sapphire displayed at the American Museum of Natural History. Many sapphires undergo heat treatment to enhance color and clarity, a common and accepted practice in the market. Synthetic sapphires are also produced in laboratories for industrial and jewelry use.

Frequently Asked Questions

What is the difference between sapphire and ruby?

Both are varieties of the mineral corundum. The difference is color: ruby is red due to chromium, while sapphire includes all other colors, with blue being the most famous.

Where are the most famous sapphires found?

Kashmir (India) sapphires are legendary for their velvety blue hue. Sri Lanka and Myanmar also produce high-quality gems. Madagascar is a more recent source.

How can you tell if a sapphire is real?

Authenticity can be verified by a gemologist. Characteristics such as hardness, inclusions, and light refraction aid identification. Heat treatment is common and does not indicate a fake.