In the jewelry industry, it is assumed that rubies have been heat treated unless otherwise specified. Most jewelry-quality rubies are heat-treated to enhance the gemstone's color and vibrancy.
Asian Gem Centre only deals in Rubies and Sapphires that are treated with heat or stones that are not treated at all. We DO NOT carry stones with the treatments such as lead filling, surface diffusion (surface coloring treatment), oiling, dyeing, waxing, lab created synthetics, or imitations.
Rubies and Sapphires are heated to improve their clarity and color. At temperatures above 1700 degrees Celsius, the silk dissolves and improves the color and clarity of the stone. This treatment can turn colorless corundum into a blue ruby. At lower temperatures, silk can be improved and the color lightened.
Some of our rubies have undergone no treatment of any kind. These rare gemstones that consist of less than 10% of the market.