Spinel
The Gem Mistaken for Ruby
What Is Spinel?
Spinel is a hard, glassy gemstone that forms naturally as sharp, octahedral crystals. It is a mineral made primarily of magnesium and aluminum oxides, which give it excellent durability and clarity. Because of its crystal structure, spinel often appears with well-defined, pointed shapes. This gemstone, which shares its name with the mineral, has long been valued for both its strength and beauty. Its hardness makes it suitable for everyday jewelry.
Colors and What Creates Them
Spinel occurs in a wide range of colors, including red, pink, blue, orange, purple, and black. The most valuable shades are bright red, cobalt blue, vivid pink, and orange. Red and pink spinels owe their color to the presence of chromium. Blue spinels can be colored by iron, while the most vibrant blue tones come from cobalt. Purple and orange varieties are created by a combination of iron and chromium.
Name and Crystal Appearance
The name “spinel” is believed to come from the Latin word spina, meaning “spine” or “thorn.” This name likely refers to the sharp, pointed crystal shapes in which spinel is often found. These naturally sharp edges helped distinguish spinel visually, even before its true identity was understood. Despite this, its resemblance to other gemstones caused centuries of confusion. Its striking appearance contributed greatly to its long-standing fame.
A Gem Often Mistaken for Royalty
For more than a thousand years, spinel was commonly mistaken for ruby or sapphire. In 1783, mineralogist Jean-Baptiste Louis Romé de Lisle officially identified spinel as a separate mineral. Many famous “rubies” in history later turned out to be spinels. One of the most famous examples is the Black Prince’s Ruby in the British Imperial Crown, which is actually a red spinel. This discovery reshaped gemstone history.
Where Spinel Is Found
Spinel is mined in several parts of the world, including Sri Lanka, Vietnam, Myanmar, Thailand, and Cambodia. Additional sources include Afghanistan, Tajikistan, Nepal, Madagascar, Nigeria, Tanzania, and Australia. The largest spinel ever discovered is the Samarian Spinel, weighing an impressive 500 carats. It is part of the Iranian Crown Jewels and is considered one of the world’s most important gemstones. Such finds highlight spinel’s rarity and significance.
Hardness, Meaning, and Care
Spinel ranks 8 on the Mohs scale of hardness, making it a durable and long-lasting gemstone. It was recently added as an official birthstone for the month of August. Many people believe spinel symbolizes energy renewal, resilience, and rejuvenation. Because of its toughness, it is relatively easy to care for. The best way to clean spinel jewelry is with warm, soapy water and gentle handling.
📌 Spinel: Summary
- Hard, durable gemstone; forms sharp octahedral crystals
- Colors: red, pink, blue, orange, purple, black;
red/pink from chromium, blue from cobalt/iron - Often mistaken for ruby; like famous:
Black Prince’s “Ruby” in British Crown is actually spinel - Found in Myanmar, Sri Lanka, Vietnam, Thailand,
Madagascar, Africa - Hardness 8 on Mohs scale; August birthstone