Corundum var Ruby Crystal Natural Aluminium Oxide Mineral Specimen Genuine Collector Gem Display Stone with Certificate

Corundum var. Ruby – Natural Aluminium Oxide Mineral Specimen

This genuine Corundum var. Ruby specimen is a natural aluminium oxide mineral, carefully selected for colour, crystal character, and collector appeal. The photograph shows an example of the actual specimen you will receive. Please refer to the listing images for full sizing and scale details.

Your Ruby specimen includes a Certificate of Authenticity lifetime guarantee generic card, confirming it is a 100% genuine natural mineral.

Mineral Species & Chemical Composition

Ruby is the red variety of Corundum, with the chemical formula:

Al₂O₃ (Aluminium Oxide)

Corundum belongs to the oxide mineral group and crystallises in the trigonal crystal system. Pure corundum is colourless, but trace amounts of chromium (Cr³⁺) replace aluminium within the crystal lattice, producing the characteristic red colour that defines Ruby.

Key mineralogical properties include:

• Mineral Group: Oxide

• Chemical Formula: Al₂O₃

• Crystal System: Trigonal

• Hardness: 9 on the Mohs scale

• Lustre: Vitreous to adamantine

• Transparency: Transparent to opaque depending on specimen quality

• Cleavage: None (conchoidal fracture)

With a hardness of 9, Ruby is one of the hardest naturally occurring minerals, second only to diamond.

Geological Formation

Corundum forms under high-temperature conditions in metamorphic and igneous environments. Ruby is most commonly found in metamorphic rocks such as marble or in high-grade metamorphic terrains where aluminium-rich rocks undergo intense heat and pressure.

In marble-hosted deposits, chromium-bearing fluids interact with aluminium-rich rock, allowing Ruby crystals to form. Ruby can also occur in basalt-related deposits or in alluvial secondary deposits where weathering releases crystals from their original host rock.

Associated minerals may include calcite, spinel, garnet, mica, or feldspar depending on the geological environment.

Colour & Crystal Characteristics

Ruby is defined by its red colour, which can range from pinkish-red to deep crimson depending on chromium content. Some specimens may show natural colour zoning, internal inclusions, or crystal growth lines typical of corundum formation.

Crystal forms are often hexagonal prisms or barrel-shaped crystals reflecting the trigonal symmetry of corundum. Massive or partially formed crystal fragments are also common in natural specimens.

Natural inclusions are part of the geological history of Ruby and may include rutile needles, mineral inclusions, or growth features. No artificial treatments or enhancements have been applied unless explicitly stated.

Collecting & Gemological Significance

Ruby is one of the most historically significant and widely recognised gemstone varieties in the world. As a member of the corundum family, it shares its mineral species with Sapphire, which includes all non-red corundum varieties.

This specimen is ideal for:

• Mineral collections

• Gemology study

• Crystal system displays

• Educational geology sets

• Collector display cabinets

In some traditions, Ruby is spiritually associated with vitality and strength; these associations are belief-based rather than scientific.

Authenticity & Individual Selection

Each Corundum var. Ruby specimen is a carefully chosen genuine mineral. The photograph shows an example of the actual specimen you will receive. Please review all images for scale, colour, and natural variation.

Every piece is supplied with a Certificate of Authenticity lifetime guarantee generic card, confirming its genuine natural origin.

A classic example of aluminium oxide mineral formation, this Corundum var. Ruby specimen represents one of the world’s most iconic mineral species and offers strong collector appeal, geological importance, and enduring display value.