Although Hamid Bros keep a range of unheated sapphire, it is restricted due to limited availability within the market. Heating is a traditional and accepted process that has been recognised within the gem industry for over 40 years. Various gemstones including corundum, quartz and beryl may undergo some form of heating at a range of temperatures to produce different results. Sapphires and Rubies are heated to temperatures ranging from 1100 to 1600°C to improve clarity and / or colour and overall appearance. Sapphires and Rubies, which are found close to thermal venting in the earth, undergo a natural heating process. Heating Sapphires and Rubies that are not found in these locations is imitating the natural process. No radiation, chemicals or health risks are involved in this traditional practice. Heating is common with the vast majority of natural Sapphires and Rubies available today. Without this treatment there would be a very limited supply of attractive gems available and prices would be extremely high.