Ruby Crystal Madagascar Natural Red Corundum Mineral Specimen 20-45mm Genuine Collector Display Stone with Certificate of Authenticity

Natural Ruby Crystal – Red Corundum from Madagascar

This genuine Ruby crystal from Madagascar is a natural red variety of corundum, carefully selected for colour, structure, and display appeal. Each specimen measures approximately 20–45mm. The photograph shows an example of the actual specimen you will receive. Please refer to the listing images for full sizing and visual detail.

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

Mineral Species & Chemical Composition

Ruby is the red variety of Corundum, composed of aluminium oxide with the chemical formula Al₂O₃. It belongs to the oxide mineral group and crystallises in the trigonal crystal system.

The red colour in Ruby is caused by trace amounts of chromium substituting for aluminium within the crystal lattice. The intensity of the red tone can vary depending on chromium concentration and geological conditions during formation.

Corundum ranks 9 on the Mohs hardness scale, making Ruby one of the hardest natural minerals, second only to diamond. This exceptional hardness contributes to its durability and long-standing use in jewellery and mineral collections.

Geological Formation – Madagascar

Madagascar is one of the world’s most significant sources of high-quality corundum, including Ruby. Rubies from Madagascar are typically found in metamorphic environments, particularly within marble-hosted deposits or high-grade metamorphic rocks formed under intense heat and pressure.

During regional metamorphism, aluminium-rich rocks recrystallise, and under suitable chemical conditions, corundum forms. The presence of chromium leads to the development of the characteristic red colour that defines Ruby.

Madagascar Rubies are known for their vibrant colour range, often displaying shades from pinkish-red to deep crimson. Associated minerals may include calcite, feldspar, mica, amphibole, or spinel depending on the specific geological setting.

Colour, Structure & Physical Characteristics

These Ruby specimens display natural red to pinkish-red hues typical of Madagascan material. Colour intensity may vary slightly between individual pieces within the 20–45mm size range.

Key mineralogical properties include:

• Mineral Group: Oxide

• Species: Corundum (Ruby variety)

• Chemical Formula: Al₂O₃

• Crystal System: Trigonal

• Colour: Red to pinkish-red

• Lustre: Vitreous to subadamantine

• Transparency: Transparent to opaque depending on crystal quality

• Hardness: 9 Mohs

Natural growth lines, inclusions, or surface textures are common features of authentic corundum and reflect its geological origin. These specimens have not been artificially dyed or treated.

Collecting & Display Appeal

Ruby is one of the most historically significant and recognisable gemstone minerals. As a variety of corundum, it is highly prized among collectors due to its hardness, vivid colour, and geological importance. Madagascan material is especially desirable for its strong colour saturation and varied crystal forms.

Ruby is traditionally associated in spiritual practices with vitality and strength; these associations are cultural and belief-based rather than scientific.

With its bold red colour and compact 20–45mm size, this specimen makes an excellent addition to mineral cabinets, gemstone collections, educational displays, or curated decorative arrangements.

Authenticity & Individual Selection

Each Ruby crystal is a carefully chosen genuine specimen. The listing photograph shows an example of the actual piece you will receive. Please review the images for precise sizing and expected appearance within the stated 20–45mm range.

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

A striking example of Madagascan corundum, this Ruby crystal represents the remarkable geological processes of high-grade metamorphism and stands as a classic and highly collectible mineral specimen.