The mineral corundum is colourless, yet traces of elements such as chrome, iron, titanium or vanadium create a multi-coloured spectrum of gems, ruby being the red variety.
The name ruby is derived from the Latin 'rubens' meaning red.
The 'Burmese Rubies' are so called because gems with a deep rich red hue are of the colour of those mined in Burma, and these are the highest quality stones.
Rubies of more than three carats in size are very rare.
A Pair of Contemporary Cufflinks