R U B Y

 

Hardness 9
Modern birthstone: July

 

 

The red corundum is called ruby, from the Greek name for red - rubeus. There is no demarcation between ruby and sapphire – they are the same chemical composition but the colour pigment  influencing ruby is chrome. The most sought-after colour is “pigeon blood” red – pure red with a slight blue hue. The names “Burmese' or 'Siam Ruby” refer to colour and not to origin.

 

Large rubies are very rare. Good colour rubies are one of the most expensive gems. Large rubies are rare and therefore more expensive than comparable size diamonds. Rubies are hard but brittle, so care must be taken when setting and cutting.