The birthstone for February is amethyst, the violet-to-purple variety of crystalline quartz (SiO₂), formally designated to the month by the American National Retail Jewellers Association in its landmark 1912 standardised birthstone list. Far from an arbitrary modern assignment, the pairing of amethyst with February has roots in ancient Roman, Hebrew, and early Christian traditions, making it one of the most historically continuous birthstone associations in the calendar. Today amethyst remains among the most widely worn and commercially significant coloured gemstones in the world, prized equally for its colour range, its durability, and its accessibility across virtually every price point.

Colour and Character

Amethyst owes its purple colour to trace iron impurities within the quartz lattice combined with natural irradiation during crystal growth. The resulting colour centres, known as colour centres or Farbzentren, produce hues ranging from the palest lilac through mid-violet to the deep, saturated purple sometimes described in the trade as "Siberian" quality — a term historically associated with the richly coloured material once sourced from the Ural Mountains of Russia. The finest stones display a pure, slightly reddish purple with no undesirable brown or grey modifiers. Secondary red flashes, visible as the stone moves in light, are considered a mark of quality in top-grade material.

On the Mohs scale amethyst registers at 7, giving it adequate resistance to everyday wear in rings, pendants, earrings, and bracelets, though it should be protected from prolonged exposure to strong direct sunlight, which can cause gradual colour fading in some specimens.

Principal Sources

Amethyst is produced on every inhabited continent, but the following localities dominate the modern gem trade:

• Brazil — The state of Rio Grande do Sul, particularly the Ametista do Sul and Iraí districts, supplies the largest volume of amethyst in the world. Much of this material occurs in basaltic geodes of considerable size. Colour tends toward medium purple, and very large clean crystals are readily available.
• Uruguay — Uruguayan amethyst, mined primarily in the Artigas department, is generally darker and more intensely saturated than its Brazilian counterpart, often approaching the deep violet prized by collectors. The geodes from this region are among the most recognisable in the mineral specimen trade.
• Zambia — The Kariba mine in southern Zambia produces amethyst of notably fine colour, frequently a rich, slightly reddish purple with good transparency. Zambian material has gained considerable respect in the international gem trade over recent decades.
• Arizona, USA — The Four Peaks mine in Maricopa County yields amethyst of exceptional colour, historically compared to the old Siberian standard. Production is limited and the material commands a premium.
• Other sources — Significant amethyst also comes from Madagascar, South Korea, India, Mexico, and Canada, among other localities.

Treatment

Heat treatment is the principal enhancement applied to amethyst in the gem trade. Gentle heating — typically in the range of 400–500 °C — can lighten stones that are too dark or unevenly saturated, improving their commercial appeal. At higher temperatures, or under different atmospheric conditions, amethyst converts irreversibly to yellow or orange quartz, sold commercially as citrine. Material that displays a mixture of amethyst purple and citrine yellow in the same crystal is known as ametrine, a naturally occurring phenomenon found most famously at the Anahí mine in Bolivia, though it can also be produced artificially by partial heat treatment. Reputable laboratories including the GIA routinely identify heat treatment in amethyst, though disclosure practices vary across the trade.

Historical and Symbolic Associations

The name derives from the ancient Greek amethystos, meaning "not intoxicated," reflecting the widespread classical belief that the stone protected its wearer from drunkenness. Goblets were carved from amethyst or lined with it for this purpose. In the Hebrew tradition, amethyst — identified as ahlamah — was one of the twelve stones of the High Priest's breastplate, each associated with a tribe of Israel and, in later interpretation, with a month of the year. Early Christian bishops adopted amethyst as a symbol of piety and celibacy; the "bishop's stone" remained a fixture of ecclesiastical jewellery through the medieval and Renaissance periods. In the modern birthstone context, amethyst is associated with qualities of peace, clarity of mind, and inner strength.

In the Trade

Amethyst occupies a unique position in the coloured gemstone market: it is simultaneously a fine gemstone capable of reaching significant per-carat values in top quality and one of the most affordable purple stones available in commercial grades. The democratisation of supply — driven largely by Brazilian and Uruguayan production — means that amethyst is accessible to jewellers and consumers at virtually every level of the market. Stones of exceptional colour, clarity, and origin (particularly Four Peaks or fine Zambian material) are collected seriously and can command prices that reflect their rarity relative to the broader amethyst supply. As the February birthstone, amethyst benefits from consistent year-round retail demand, with particular strength in the first quarter.

Further Reading

• GIA Gem Encyclopedia: Amethyst
• AGTA Gemstone Library: Amethyst