Rubies, along with diamonds, emeralds and sapphires, are a precious gem in high demand.  Rubies, along with their sister sapphires, are formed from the mineral corundum.  The deep red saturation of the finest rubies has long been their biggest market asset and they have the unique quality of being able to attract very high prices even with significant inclusions and in some very rare stones this can lead to the “star stone” effect.  The vast majority of rubies have undergone some form of treatment or enhancement so it is well worth understanding the effects these can have on value and to also look for stones that have been certified by a well respected laboratory.