5 x Herkimer Diamond Quartz Crystals USA Natural Double Terminated Clear Mineral Specimens Gift Set

5 x Genuine Herkimer Diamond Quartz Crystals – New York, USA

This listing is for five genuine Herkimer Diamond crystals, carefully selected natural quartz specimens from the famous Herkimer County region, New York, USA. The photographs show the exact pieces you will receive. Each crystal is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming it is a 100% genuine mineral specimen.

Full sizing can be seen in the photographs for accurate scale and proportions.

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Mineral Type & Crystal Structure

Herkimer Diamonds are not true diamonds but exceptionally clear, naturally double-terminated quartz crystals (Silicon Dioxide – SiO₂). They crystallise in the trigonal crystal system, forming distinctive six-sided prisms that terminate naturally at both ends.

Unlike most quartz crystals, which grow attached to a matrix and develop a single termination, Herkimer Diamonds typically form free within cavities in dolostone. This allows them to develop their characteristic double terminations, sharp faces, and well-defined points.

These crystals are renowned for:

• High clarity and water-clear transparency

• Natural double-terminated formation

• Well-formed prism faces

• Sharp, reflective terminations

• Compact, naturally faceted appearance

Their natural geometric structure and brilliance give them their well-known “diamond” nickname.

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Geological Origin – Herkimer County, New York

These crystals originate from the Cambrian-age dolostone formations of Herkimer County, approximately 500 million years old. They formed within vugs (open cavities) in the host rock, where silica-rich fluids slowly crystallised over geological time.

The unique geological conditions of the region — including low iron content and stable cavity environments — contributed to the exceptional clarity and sharp crystal habit for which Herkimer Diamonds are globally recognised.

Associated minerals in the region may include:

• Dolostone matrix

• Calcite

• Pyrite

• Anthraxolite (black carbon inclusions)

Some specimens may naturally display inclusions such as:

• Water inclusions (sometimes called “enhydros”)

• Carbon deposits

• Internal fractures or veils

• Phantom growth structures

All inclusions are natural and part of the crystal’s geological history.

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Appearance & Natural Characteristics

These Herkimer Diamond specimens are typically:

• Colour: Clear to water-transparent, occasionally with slight smoky or grey tones

• Lustre: Vitreous (glass-like)

• Transparency: Transparent to translucent

• Hardness: 7 on the Mohs scale

• Crystal habit: Double-terminated prismatic quartz

Each crystal is unique, with its own internal landscape formed over millions of years. Natural surface textures, minor growth marks, or inclusions are expected in authentic, untreated quartz.

These specimens are completely natural and unenhanced, with no artificial treatments or polishing.

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Collecting, Display & Gifting

Herkimer Diamonds are highly sought after by mineral collectors due to their clarity, crystal perfection, and famous locality. A set of five makes an excellent addition to:

• Mineral and geology collections

• Educational study collections

• Crystal display cases

• Lapidary or jewellery design projects

• Unique natural history gifts

They are also traditionally associated in spiritual circles with clarity and focus, though this listing makes no claims beyond their value as natural mineral specimens.

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Authenticity Guarantee

• 5 x Genuine Herkimer Diamond Quartz Crystals

• Origin: Herkimer County, New York, USA

• 100% Natural and Untreated

• Includes Certificate of Authenticity lifetime guarantee generic card

• You will receive the exact specimens shown in the photographs

A superb opportunity to own a small collection of one of the most famous quartz varieties in the world, directly from its classic American locality.