Bijoux Diamant Herkimer

No. Herkimer diamonds are quartz crystals — specifically, a high-clarity variety of double-terminated quartz with naturally faceted geometry sourced primarily from Herkimer County, New York. The "diamond" in the name refers to the visual resemblance — the brilliance, clarity, and geometric facets that led 18th-century discoverers to mistake them for actual diamonds. Diamonds (Mohs 10) are crystalline carbon; Herkimer diamonds (Mohs 7.5) are quartz.

A Herkimer diamond is a naturally double-terminated quartz crystal that forms with two pointed ends and 18 facets without cutting or polishing. They form within cavities ("vugs") in approximately 500-million-year-old dolostone rock in Herkimer County, New York. The crystals grow slowly over millions of years, developing their distinctive double-terminated geometry without external pressure constraints from host rock.

The original and primary source is Herkimer County, New York — specifically the Little Falls Dolostone formation. Active mining locations include Herkimer Diamond Mines, Ace of Diamonds Mine, and Crystal Grove. Geologically similar double-terminated quartz crystals are found in Pakistan, Tibet, China, Mexico, Norway, and Afghanistan, but the "Herkimer diamond" name is geographically specific to the New York deposits.

Herkimer diamond jewelry is significantly more accessible than diamond, sapphire, or moissanite jewelry at equivalent sizes. Pricing varies based on crystal size (small 4-6mm crystals through statement 14mm+ crystals), clarity grade, geometric quality, and metal choice. Sterling silver options provide the entry tier; solid 14K gold delivers the heirloom tier. See individual product pages for current pricing.

Herkimer diamonds in the geographically specific New York deposits are mined commercially and remain available, though high-clarity double-terminated specimens in larger sizes (12mm+) are increasingly less common in active mining. Standard sizes (4-10mm) are reliably available.

Common contemporary associations include mental clarity, spiritual attunement, energy amplification (the double-termination is interpreted in crystal traditions as channeling energy in both directions), and connection between higher and lower energy states. The stone is associated with the crown chakra in some chakra traditions. These are contemporary belief-based associations rather than empirically demonstrated effects.

Yes. Herkimer diamonds rank 7.5 on the Mohs hardness scale — comparable to standard quartz hardness and suitable for everyday fashion jewelry wear with reasonable care. Bezel settings and protective configurations extend daily-wear lifespan by surrounding the crystal's vulnerable termination tips with metal.

Yes, Herkimer diamonds can be cut, polished, or faceted by lapidaries — but doing so is uncommon because the natural geometry is the primary value driver. Most Herkimer diamond jewelry preserves the crystals in their naturally faceted state. For pieces explicitly featuring cut Herkimer diamonds, the cut style is typically specified in the product description.

Standard quartz crystals form with single terminations attached to host rock; Herkimer diamonds form floating freely in cavities and develop double terminations. The Herkimer County deposits also produce crystals with exceptional clarity and geometric symmetry compared to typical quartz from other regions. Same Mohs hardness (7.5) as standard quartz, but visually distinct.

Yes — Herkimer diamond jewelry is well-suited to customization because crystal characteristics vary significantly stone-to-stone. Common custom requests include stone selection for specific clarity or geometry preferences, custom setting design around individual crystal characteristics, alternate metals, accent stone choices, and matched jewelry sets. Our custom ring builder handles full custom designs from scratch.

Yes. Herkimer diamonds come from documented active mining operations in Herkimer County, New York — small-scale commercial mining within US regulatory frameworks. Supply chain transparency is significantly higher than for many internationally sourced gemstones. We pair Herkimer diamond crystals with recycled precious metals from certified refiners. See our ethical sourcing and our mission.

This collection includes Herkimer diamond necklaces, earrings, pendants, fashion rings, and statement pieces. For Herkimer diamond engagement rings specifically, see our dedicated Herkimer diamond engagement rings collection.