RAREST Herkimer Diamond — 6.40 carats Exceptional clarity - NO RESERVE PRICE - Height: 14 cm - Width: 10 cm- 1.28 g - (1)

Exceptional natural 6.40-carat Herkimer Diamond, with an especially complex and spectacular crystal architecture. The specimen reveals a beautiful biterminated structure, with geometrically shaped, highly reflective faces surrounding an intensely rich interior.

From various angles, its transparency reveals a succession of veils, microstructures, natural fractures and dark-to-golden inclusions that seem to hang in the heart of the crystal.

These features serve as witnesses to the different stages of its growth and give the specimen remarkable depth: observation continuously changes with orientation and light. Its combination of biterminated morphology, transparency, internal complexity and substantial dimensions makes it a particularly interesting piece for a discerning mineral collection.

This is a rare biterminated quartz specimen, belonging to the family of crystallizations sought after under the name “Herkimer Diamond” for their natural geometry and exceptional brilliance.

Characteristics

- Collection name: Herkimer Diamond
- Mineral nature: Natural biterminated quartz
- Origin: Pakistan
- Weight: 6.40 carats
- Dimensions: 14 × 10 × 7.5 mm
- Morphology: Natural biterminated crystal
- Color: Colorless with internal smoky to slightly golden nuances
- Transparency: Transparent to locally translucent
- Luster: Intense vitreous
- Crystallization: Entirely natural
- Terminations: Natural
- Internal structure: Very complex, with veils, inclusions and natural fractures
- Condition: Natural, uncut
- Interest: Mineral collection, crystallography and macrophotography

An exceptionally complex internal architecture

This specimen immediately stands out for the richness of its inner world. Unlike perfectly clear crystals whose interest rests mainly on transparency, this one combines clear areas with a multitude of internal structures.
Reflective planes, punctual inclusions, dark zones, brown-golden nuances and natural fractures interlace at different depths. This arrangement produces a true three-dimensional landscape enclosed within the crystal.
With each change of angle, certain structures disappear while others suddenly become visible, giving the specimen extraordinarily dramatic depth.

A geometry shaped solely by nature

One of the most fascinating features of these crystals is their almost-cut appearance.
Yet the visible facets arise from the crystal’s natural growth. The different faces intercept light independently, producing sharp flashes and almost mirror-like zones.
With a length of 14 mm, the specimen offers a sufficiently large surface to fully appreciate this natural architecture while preserving the characteristic proportions of a collectible crystal.

A genuine archive of its formation

The structures visible inside are not merely decorative: they are the physical witnesses of the crystal’s growth history.
During its formation, changes in the surrounding conditions could leave different internal signatures. Veils, microfractures, inclusions and irregularities thus become traces of a complex geological history.
It is precisely this combination of a geometric crystalline envelope and a highly active core that gives this specimen its singular character.

The history of the “Herkimer Diamonds”

The name “Herkimer Diamond” historically originates from the famous biterminated crystals discovered in Herkimer County and nearby areas in New York.
Their transparency, brilliance and especially their striking natural geometry earned them this historical comparison with a diamond. The name has since become iconic among mineral collectors.
Biterminated crystallizations with comparable morphology are also found in other parts of the world. Their actual geographic origin must therefore be distinguished from this historical name — the origin of the present specimen is precisely indicated in its characteristics.

A collectible piece to observe from every angle

With 6.40 carats and dimensions of 14 × 10 × 7.5 mm, this specimen has a remarkable presence while maintaining enough transparency to allow detailed observation of its internal architecture.
At a glance, it attracts with its brilliance and geometry. Under a loupe or macro lens, it reveals a whole new level of complexity, with a multitude of superimposed structures gradually becoming perceptible.

A singular piece where nearly perfect exterior geometry contrasts with an extraordinarily complex interior, a true natural testimony to the history of its crystallization.

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