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 / material | Corundum |
|---|---|
| Chemistry | Al2O3 |
| Crystal system | Trigonal |
| Colour | Red to purplish red |
| Refractive index | 1.762 – 1.77 |
| Birefringence | 0.008 |
| Specific gravity | 3.99 – 4 |
| Mohs hardness | 9 |
| Luster | Vitreous |
| Transparency | Transparent to translucent |
| Toughness | Excellent |