Onyx Crystal Egg Polished Black Onyx Stone Carving Specimen From Alice Purnell Collection with Certificate of Authenticity

Polished Onyx Crystal Egg – Natural Stone Carving Specimen

This elegant Onyx Crystal Egg is a genuine natural stone specimen, carefully selected for its smooth polish, rich colouring, and classic decorative form. Offered from the Alice Purnell Collection, this piece includes a Certificate of Authenticity lifetime guarantee generic card. The photographs show the exact specimen you will receive, and full sizing details are provided in the listing images.

Carved stone eggs are highly popular among collectors and décor enthusiasts due to their timeless shape and the way they highlight the natural banding and depth of colour within the mineral. This polished onyx egg is a striking display piece with a strong collector appeal.

Mineral Information – Onyx (Banded Chalcedony)

Onyx is a variety of chalcedony, which is a microcrystalline form of quartz composed of silicon dioxide (SiO₂). Chalcedony forms in the trigonal crystal system, though its crystals are typically too fine to be seen individually.

True onyx is characterised by its parallel banding, often in black, white, grey, or brown layers. Many polished onyx carvings display subtle natural band patterns that add depth and individuality to each piece.

Onyx has a Mohs hardness of around 6.5 to 7, making it a durable mineral suitable for carving, polishing, and long-term display. Its smooth, glossy finish enhances its natural elegance and highlights any banding or tonal variation.

Geological Formation and Natural Origin

Onyx forms when silica-rich waters deposit layers of chalcedony within cavities of volcanic or sedimentary rocks. Over long periods of time, repeated mineral deposition creates the distinctive layered structure that defines onyx.

These deposits often occur in regions with historic volcanic activity, where mineral-rich groundwater circulated through fractures and voids. Onyx is commonly associated with other silica minerals such as agate and jasper, all part of the chalcedony family.

The egg shape is crafted from solid natural stone, allowing the internal banding and colour transitions to be appreciated from every angle.

Decorative and Collecting Appeal

This polished onyx egg is an excellent addition to any mineral collection or decorative space. The egg form is symbolic in many cultures and is often traditionally associated with renewal and balance in a spiritual sense, though it is primarily valued today for its aesthetic beauty and craftsmanship.

This specimen is ideal for:

• Mineral and crystal collectors

• Decorative stone carving enthusiasts

• Home and office display décor

• Unique gifts for geology and natural history lovers

• Collectors of chalcedony and quartz varieties

The deep tones of onyx make it a versatile display piece that complements both modern and traditional interiors.

Authenticity and Provenance

This onyx crystal egg is a genuine natural mineral specimen from the Alice Purnell Collection. It includes a Certificate of Authenticity lifetime guarantee generic card, confirming it as an authentic stone specimen.

You will receive the exact piece shown in the listing photographs, carefully chosen for its quality, polish, and presentation.

A polished onyx egg like this is a timeless collector’s piece, combining natural geological history with elegant craftsmanship and enduring decorative appeal.