5 x Herkimer Diamond Quartz Crystals USA Natural Double Terminated

5 x Herkimer Diamond – Natural Quartz Crystals from USA

This set includes 5 genuine Herkimer Diamond crystals from the United States, carefully selected for clarity, natural double terminations, and overall collector appeal. The photograph provided shows the actual specimens you will receive. Full sizing please see photo for exact scale and proportions. Each set includes a Certificate of Authenticity lifetime guarantee generic card, confirming these as genuine natural mineral specimens.

Mineral Type & Scientific Classification

Herkimer Diamonds are not true diamonds but exceptionally clear, naturally double-terminated crystals of quartz (Silicon Dioxide – SiO₂). They crystallise in the trigonal crystal system and are a variety of rock crystal quartz known for their distinctive clarity and symmetrical form.

Unlike typical quartz points that form attached to a matrix at one end, Herkimer Diamonds commonly grow freely within cavities, allowing them to develop natural terminations at both ends. This results in their well-known double-terminated shape, often with sharply defined crystal faces.

Quartz has a hardness of 7 on the Mohs scale, making it durable and suitable for long-term display and collecting. Its vitreous lustre and transparent appearance contribute to its high aesthetic value.

Geological Origin & Formation

Herkimer Diamonds are most famously sourced from Herkimer County, New York, USA, where they formed within dolostone host rock dating back approximately 500 million years to the Cambrian period.

These quartz crystals developed in small cavities within carbonate rock. Silica-rich fluids slowly crystallised under stable geological conditions, allowing the formation of exceptionally clear and well-shaped quartz. Over time, erosion and mining exposed these cavities, revealing the free-growing double-terminated crystals.

Associated minerals in Herkimer deposits may include calcite, dolomite, pyrite, or bitumen inclusions. Some crystals may contain natural inclusions, growth lines, or minor surface contact marks, reflecting their geological environment.

Appearance, Clarity & Natural Features

This set of 5 Herkimer Diamonds may display:

• High natural clarity

• Double-terminated crystal form

• Six-sided prismatic structure

• Sharp, natural terminations

• Subtle internal inclusions or growth features

• Occasional minor natural contact points

Each crystal is unique in shape and character, formed entirely through natural geological processes. Their small, well-defined form makes them popular among mineral collectors and quartz enthusiasts alike.

Presentation & Authenticity

• Mineral: Quartz (Herkimer Diamond variety)

• Chemical Formula: SiO₂

• Crystal System: Trigonal

• Origin: USA

• Quantity: 5 natural crystals

• Authenticity: Includes Certificate of Authenticity lifetime guarantee generic card

• Sizing: Please refer to photo for full sizing details

These crystals are ideal for mineral collectors, micromount displays, geology study collections, jewellery makers seeking natural double-terminated quartz, or as a distinctive natural history gift.

Collecting & Traditional Associations

Herkimer Diamonds are highly sought after due to their clarity and symmetrical crystal habit. Their naturally formed double terminations distinguish them from many other quartz varieties and make them a staple in quartz-focused collections.

In spiritual traditions, Herkimer Diamonds are traditionally associated with clarity and amplification; these interpretations are cultural rather than scientific. From a mineralogical standpoint, their value lies in their unique growth environment, crystal symmetry, and exceptional transparency.

A genuine set of 5 Herkimer Diamond quartz crystals from the USA, carefully selected for quality and supplied with certificate of authenticity.