Herkimer diamonds

Herkimer diamonds

Herkimer diamonds are exceptionally clear, naturally double-terminated quartz crystals discovered in Herkimer County, New York. Despite their name, they are not true diamonds. Formed over 500 million years ago, they are prized by geologists and jewelers for their diamond-like brilliance, sharp geometry, and 18 natural facets. 

Quick Facts

• • Composition: Silicon dioxide (natural quartz).
  • Hardness: 7.5 on the Mohs scale (compared to 10 for true diamonds).

• Shape: Naturally pointed at both ends ("double-terminated").
• Authenticity: True Herkimer diamonds are only sourced from the dolostone rock outcrops of Upstate New York. 

Characteristics

• Clarity: They are famous for an extreme, water-clear transparency that mimics actual diamonds.
• Inclusions: Many contain small air bubbles, enhydros (pockets of water), or black carbon/anthraxolite deposits.
• No Cutting Required: Because they form naturally with a brilliant, facetted look, they are rarely polished or cut when used in wire-wrapped or raw gemstone jewelry.