Citrine is the yellow-to-orange variety of quartz, the same abundant mineral that gives us amethyst and rock crystal. Warm, sunny, and inexpensive even in large clean sizes, it is one of the most wearable and affordable of all gems, and it shares the November birthstone slot with topaz. There is one twist worth knowing: most citrine on the market was not yellow when it came out of the ground.
Yellow quartz, mostly made from purple
Natural citrine, colored by traces of iron, is genuinely rare. The great majority of commercial citrine is heat-treated amethyst (or heated smoky quartz): when many amethysts are heated to around 470–560°C, their purple turns yellow, gold, or reddish orange. This treatment is stable, permanent, and accepted, and it is the reason citrine is so plentiful and cheap despite natural citrine being scarce.
How to tell heated from natural
Heat-treated amethyst often shows a slightly stronger orange or reddish tint and can have color concentrated near the tips of the original crystal, while much natural citrine is a paler, more even lemon-yellow. Distinguishing them reliably takes a lab, but since prices are modest either way, this is mostly a matter of accurate disclosure rather than large sums.
Color and the "Madeira" grades
Citrine ranges from pale lemon through rich gold to a deep orange-brown often called Madeira citrine, after the wine. Saturated golden-orange stones are generally the most prized. Because quartz grows large and clean, citrine is a favorite for big statement stones and bold cuts at prices that stay reasonable even at 20-plus carats.
Citrine, amethyst, and ametrine
Citrine has a close family relationship with other quartz gems. Heat turns most amethyst into citrine; certain material heats to a green prasiolite. And ametrine is a natural two-color combination of amethyst and citrine in a single crystal, produced mainly in Bolivia, where purple and gold zones meet.
Durable and easy to wear
At Mohs 7, citrine is hard enough to resist everyday dust and scratching and is well suited to rings, pendants, and daily wear. It has no cleavage and reasonable toughness. Like amethyst, its main sensitivity is to prolonged intense heat, which can lighten or alter the color, so avoid leaving it in strong sun or exposing it to high heat.
Caring for citrine
Citrine is low-maintenance. Warm soapy water and a soft brush clean it well, and ultrasonic cleaners are generally safe for untreated, un-fractured stones (avoid them if a stone might be dyed or fracture-filled). Keep it out of prolonged high heat to preserve its color, and store it apart from harder gems.
Citrine gives you warm, golden, large-size color at a friendly price, most of it thanks to a bit of heat applied to amethyst. Know where the color comes from, keep it out of harsh heat, and it makes a durable, cheerful everyday gem.
