This category offer rubies that have been enhanced by low temperature heating only. This treatment is viewed as common for the ruby and sapphire and accepted as a natural gemstone by the industry. Quality rubies are now very rare, therefore more than 95% of the natural rubies are heated. They are heat treated on the rough stones to improve color, remove purple tinge, blue patches and silk. These heat treatments typically occur around temperatures of 1800 °C (3300 °F). Some rubies undergo a process of low tube heat, when the stone is heated over charcoal of a temperature of about 1300 °C (2400 °F) for 20 to 30 minutes. The silk is only partially broken as the color is improved. Their value is slightly affected by the heating, for example the same gemstone not enhanced could be valued 25-50% more depending on size and quality.

Rubies have always been held in high esteem in Asian countries. They were used to ornament armor, scabbards, and harnesses of noblemen in India and China. Rubies were laid beneath the foundation of buildings to secure good fortune to the structure. GemsFeed has a long history of heating, cutting and polishing the ruby following jewelry manufactures standards in quality of calibrated and single gemstones. So come enjoy your savings with us! If you would like to order calibrated heated rubies in quantity, contact us fore more information.