Sapphire – a fascinating gemstone

How is sapphire formed?
The first synthetic sapphires were created at the beginning of the 20th century. The method used back then was slow and labor-intensive, yielding only small stones. Gemologists later improved the process.

Today, sapphires are grown using the hydrothermal technique. This involves dissolving aluminum oxides and hydroxides at high temperature and pressure. Seed crystals, suspended on silver wires, grow into gemstones until the raw material is depleted.

Properties of sapphire
Sapphire is believed to have healing properties. It supports heart health, lowers blood pressure, aids sleep, and benefits eyesight. It soothes skin issues, reduces swelling, speeds wound healing, lowers fever, and helps with colds.

Symbolism of sapphire
Since ancient times, sapphire has been linked with mysticism. Wearing it was thought to protect against curses and illness. In Persian culture, it symbolized immortality and eternal youth.

Sapphire is also a popular choice for engagement rings, symbolizing truth.

Corundum and hardness
Sapphire is part of the corundum family and scores 9 on the Mohs scale, making it one of the hardest minerals on Earth—second only to diamond. Its density ranges from 3.95 to 4.1 g/cm³.

Despite its hardness, sapphire can chip or crack, so it should be handled carefully.

Colors of sapphire
Sapphires come in a wide range of colors, determined by the amount of iron and titanium in the crystal. They may be blue, black, green, yellow, orange, violet, or even colorless. The blue variety remains the most valued.

Bivalent iron and trivalent titanium are mainly responsible for its hues. Rare black sapphires also owe their color to high iron content, combined with aluminum oxide.

Color and origin
Sapphire color strongly depends on its origin. Major sources include Sri Lanka, Cambodia, India, and Australia.

The finest stones come from Burma and Kashmir, with their exceptionally pure blue tones. Sri Lankan sapphires often display a pastel blue, and the island also produces rare padparadscha sapphires. Australian sapphires are typically navy with a greenish tint, but can also appear green-yellow.

Sapphire in jewelry
Because of its beauty and deep blue shade, sapphire has long been a favorite in jewelry. Blue stone pieces—rings, necklaces, earrings, bracelets—remain highly popular. Sapphire crystals set in silver or gold can shift in tone depending on lighting and angle.

Interesting facts about sapphire
Sapphire is traditionally associated with Sagittarius and Pisces.
The largest sapphire ever found, in Sri Lanka, weighs over 1400 carats and is valued at over 100 million dollars.
The word “sapphire” comes from the Greek sapphirus, meaning “blue.”
The British Crown is adorned with two famous sapphires: the “Star of Edward” and the “Stuart.”
Its melting point is extremely high, between 2000 and 2050 °C.