Natural Ruby 7.00 ct – Octagon Cut, Untreated, IGI Certified

Natural Ruby 7.00 ct – Octagon Cut, Untreated, IGI Certified

Name: Natural Ruby 7.00 ct – Octagon Cut, Untreated, IGI Certified
Brand: SOSNA Gems
Availability: InStock

Price on request

INQUIRE ABOUT THIS PIECE

Gemstone Specification

Carat Weight 7.0

Dimensions 12.92 x 9.72 x 4.53 mm

Color Vivid Red

Clarity Eye Clean

Shape Octagonal

Treatment Unheated and Untreated (No Indications Observed)

Origin Mozambique

Certification IGI

This 7.00 carat natural ruby from Mozambique is an extraordinary gemstone belonging to the category of exclusive investment-grade rubies. Exhibiting a vivid red color and cut into a refined octagonal (emerald) shape measuring 12.92 × 9.72 × 4.53 mm, this ruby captivates with its rarity and elegance. With high clarity and entirely untreated, it preserves its natural authenticity and purity—qualities that significantly enhance its value. Certified by IGI, one of the world’s leading gemological laboratories, this gemstone comes with independent confirmation of its quality and origin.

Large, untreated vivid red rubies above 5 carats are among the rarest gemstones globally, highly sought after by collectors and investors. This 7.00 carat piece is a museum-quality ruby, ideal for elite collections and as a secure store of wealth.

Natural Ruby 7.00 ct – Octagon Cut, Untreated, IGI CertifiedPrice on request

From gemstone to jewelry

This gemstone can be transformed into a custom-made jewel.
The example shown illustrates how a loose stone may be set into a bespoke design.
Each final piece is created individually in consultation with our experts.

Loose gemstone

Bespoke jewelry

Custom jewelry service

Selected gemstones from our collection can be transformed into bespoke jewelry.
The example above illustrates one of many possible design outcomes, each created individually in consultation with our experts to reflect both your preferences and the stone’s natural character.

Learn more about custom jewelry

Insured Express Delivery

Fully insured worldwide shipping with discreet packaging.

Gemological Disclosure

Each gemstone is professionally examined and accompanied by clear gemological information regarding its characteristics, treatments, and origin.

Ethical & Transparent Sourcing

We guarantee legal and ethical origin of every gemstone.

Secure & Trusted Purchase

Protected payments, professional handling, and client confidentiality.

Gemological overview

Technical and gemological information about this gemstone variety.

Gemological profile

Ruby is the red variety of the mineral corundum, valued for its rich color, durability, and long-standing historical significance. Its color ranges from pinkish red to deep red, with hue, tone, and saturation playing a key role in its visual character and overall appeal.
Chemically composed of aluminum oxide (Al₂O₃), ruby crystallizes in the trigonal crystal system and belongs to the oxide mineral group. In gem-quality material, ruby typically displays a vitreous luster with transparent to translucent clarity.
The refractive index of ruby generally ranges from approximately 1.76 to 1.77, producing a restrained brilliance that emphasizes depth of color rather than strong sparkle. Rubies are found in several regions worldwide, with notable sources including Myanmar, Mozambique, Thailand, Sri Lanka, and Madagascar, each associated with distinct visual characteristics.

Durability & suitability

With a hardness of 9 on the Mohs scale, ruby offers excellent durability suitable for everyday jewelry when properly set and worn with standard care. Its high resistance to scratching and lack of cleavage make it one of the most robust colored gemstones used in jewelry.
Ruby performs exceptionally well in rings, pendants, earrings, and bracelets, including designs intended for frequent wear. While natural inclusions are common and expected in ruby, thoughtful setting design can help protect the stone and preserve its appearance over time.

Treatments & authenticity

With a hardness of 9 on the Mohs scale, ruby offers excellent durability suitable for everyday jewelry when properly set and worn with standard care. Its high resistance to scratching and lack of cleavage make it one of the most robust colored gemstones used in jewelry.
Ruby performs exceptionally well in rings, pendants, earrings, and bracelets, including designs intended for frequent wear. While natural inclusions are common and expected in ruby, thoughtful setting design can help protect the stone and preserve its appearance over time.

Our approach to gemstones

We focus primarily on natural, untreated gemstones, valued for their authenticity and inherent beauty.
Any treatments or enhancements are always clearly disclosed, allowing our clients to make informed decisions based on transparent gemological standards.

Sosna Gems is not a licensed financial advisor. Gemstones are collectibles, not securities. Past performance is not indicative of future results. Legal & risk disclosure .