Fluorite

Fluorite is a calcium fluoride mineral (CaF₂) from the halide class, prized by collectors and jewelry makers for its wide color spectrum — purple, green, blue, yellow, and colorless forms are the most common, often appearing together as color bands within a single crystal. The stone is transparent to translucent, with a vitreous luster and well-developed octahedral cleavage. Many specimens show fluorescence under ultraviolet light, a phenomenon that takes its name directly from this mineral.

Fluorite Origin and Key Properties

Commercial Fluorite comes from deposits in China (now the largest producer), Mexico, Mongolia, South Africa, Spain, and Russia. Classic specimen localities include Illinois (the former state mineral), Cumbria in England, Rogerley Mine in County Durham, and smaller US sources at Amelia Court House in Virginia, Franklin in New Jersey, and the Bluebird Mine in Arizona. Gem-quality green and purple material often comes from China and Colombia; banded "Blue John" comes from a single hill in Derbyshire, England.

Fluorite measures 4 on the Mohs scale — it is the reference mineral for that point — with a specific gravity around 3.18 and a chemical formula of CaF₂. This softness matters: the stone scratches more easily than quartz (7) or beryl (7.5–8) and will chip along its cleavage planes if struck. Color ranges from water-clear to deep violet, emerald green, honey yellow, pink, and the multi-colored banded material known as rainbow fluorite.

Treatments are uncommon compared with many colored stones. Most Fluorite on the market is untreated; the color you see is natural. Some material is stabilized with resin or wax when it is porous or fractured, and a small amount may be irradiated to deepen color. Reputable sellers disclose this. Heat is generally avoided because Fluorite can lose color or fracture with thermal shock.

Fluorite in Sterling Silver Jewelry

Because the stone is soft, Fluorite is most often cut as cabochons — smooth domes that show off color banding and internal clarity without exposing fragile edges. Faceted Fluorite exists for collectors and pendant stones but is less practical in rings. Raw and polished freeform pieces are popular in pendants and statement earrings where the natural crystal structure remains visible. The translucent green-and-purple material photographed on this page is a typical cabochon treatment.

Sterling silver (.925) suits Fluorite for two reasons: the cool white metal does not compete with the stone's saturated purples and greens, and silver bezels protect the softer material better than prongs on a hard mount. Browse our fluorite jewelry collection for current pieces — most rings, pendants, and earrings at SilverRush Style fall in the $25–$95 range, with larger statement pieces reaching around $150.

Care and Cleaning

Clean Fluorite with warm water, mild soap, and a soft cloth. Skip ultrasonic and steam cleaners — vibration and heat can open cleavage planes. Keep the stone away from household chemicals, chlorinated pools, and prolonged direct sunlight, which may fade some colors over time. Store pieces in a soft pouch, separated from harder stones like topaz or sapphire that can scratch the surface.

Frequently Asked Questions