Ruby

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Ruby – Overview

Intro

Ruby is the red variety of corundum and remains one of the most iconic coloured gemstones in fine jewellery.

Overview

This starter entry positions ruby as a premium colour gemstone where hue, saturation, transparency, cut, and treatment all shape value and desirability.

About

This starter entry positions ruby as a premium colour gemstone where hue, saturation, transparency, cut, and treatment all shape value and desirability. Ruby is presented here as a structured gemstone record ready for linked buyer guides, research posts, and media galleries.

Key Properties

Mineral / materialCorundum
ChemistryAl2O3
Crystal systemTrigonal
ColourRed to purplish red
Refractive index1.762 – 1.77
Birefringence0.008
Specific gravity3.99 – 4
Mohs hardness9
LusterVitreous
TransparencyTransparent to translucent
ToughnessExcellent