Tourmalines are occasionally heated or irradiated to improve their colors. Occasionally, surface-breaking fissures may be filled with resins. Treatment stability: very good to excellent.

We do not sell treated diamonds, and the Canadian diamonds we sell come with documentation as to their untreated origin. When diamonds are treated, they may be heated, subjected to high pressure and high heat (HPHT), or irradiated to enhance their color. They may be laser-treated to improve appearance. We sell only untreated diamonds.

Sapphires are commonly treated with heat to improve color and clarity. Treatment stability: excellent. We sell untreated sapphires upon request.

We do not sell treated diamonds, and the Canadian diamonds we sell come with documentation as to their untreated origin. When diamonds are treated, they may be heated, subjected to high pressure and high heat (HPHT), or irradiated to enhance their color. They may be laser-treated to improve appearance. We sell only untreated diamonds.

We do not sell treated diamonds, and the Canadian diamonds we sell come with documentation as to their untreated origin. When diamonds are treated, they may be heated, subjected to high pressure and high heat (HPHT), or irradiated to enhance their color. They may be laser-treated to improve appearance. We sell only untreated diamonds.

Sapphires are commonly treated with heat to improve color and clarity. Treatment stability: excellent. We sell untreated sapphires upon request.

We do not sell treated diamonds, and the Canadian diamonds we sell come with documentation as to their untreated origin. When diamonds are treated, they may be heated, subjected to high pressure and high heat (HPHT), or irradiated to enhance their color. They may be laser-treated to improve appearance. We sell only untreated diamonds.

We do not sell treated diamonds, and the Canadian diamonds we sell come with documentation as to their untreated origin. When diamonds are treated, they may be heated, subjected to high pressure and high heat (HPHT), or irradiated to enhance their color. They may be laser-treated to improve appearance. We sell only untreated diamonds.

Emeralds, over the centuries, have been treated with oils and waxes to purify their transparency. Today, various types of resins are also used to penetrate the open fissures on the surface of the stones. Unless otherwise noted, we assume that all the emeralds we sell have been treated in some way. Treatment stability: Fair to Good.