Herkimer Diamond Quartz Crystal – Ace of Diamonds Mine, Herkimer County, New York

A natural Herkimer Diamond quartz crystal from the famous Ace of Diamonds Mine in Herkimer County, New York. Renowned worldwide among collectors, Herkimer Diamonds are prized for their remarkable clarity, natural brilliance, and distinctive double-terminated crystal form. Despite their name, Herkimer Diamonds are not true diamonds but exceptionally well-formed quartz crystals that occur in the dolostone formations of central New York.

This specimen was recovered from the historic Ace of Diamonds Mine, one of the most recognized collecting localities in the Herkimer district. The mine has attracted rockhounds, mineral collectors, and gemstone enthusiasts for generations seeking these unique naturally faceted quartz crystals.

Specimen Highlights

• Natural Herkimer Diamond Quartz
• Ace of Diamonds Mine locality
• Herkimer County, New York, USA
• Naturally double-terminated crystal
• Collector-quality specimen
• Classic American mineral locality
• Highly desirable quartz variety

Mineral Information

• Mineral: Quartz
• Formula: SiO₂
• Crystal System: Hexagonal
• Hardness: 7
• Luster: Vitreous
• Transparency: Transparent to translucent

What Makes Herkimer Diamonds Special?

Herkimer Diamonds are famous for their naturally occurring double terminations, meaning the crystal formed with points on both ends rather than being attached to surrounding rock during growth. This unusual growth habit is one of the characteristics that makes these crystals highly sought after by collectors.

Collectors Value Herkimer Diamonds For

• Exceptional natural clarity
• Double-terminated crystal habit
• Brilliant natural luster
• Historic New York provenance
• Jewelry and display potential
• Strong collector demand

Natural Features May Include

• Water inclusions
• Carbon inclusions
• Rainbow reflections
• Internal growth features
• Natural contact points
• Complex crystal formations

Provenance

Ace of Diamonds Mine, Herkimer County, New York, USA

Measurements

• Dimensions: 15 x 11 x 9 mm

Collector Notes

Herkimer Diamonds have become one of the most recognizable quartz varieties in the world. Only crystals recovered from the Herkimer County region are properly referred to as Herkimer Diamonds, making locality provenance particularly important to collectors.

Fine examples displaying exceptional clarity, sharp terminations, and attractive inclusions remain highly desirable additions to mineral collections focused on American minerals, quartz varieties, classic localities, crystal specimens, and New York mineralogy.

Condition

Please review all photographs carefully for crystal quality, clarity, inclusions, contact points, and overall condition, as they are considered part of the description. Natural quartz crystals commonly display growth features and minor imperfections resulting from their natural formation.