Table of Gemstone Treatments

Gemstone Form of Treatment Frequency

Reason for Treatment

Amethyst Heating Occasional To lighten color and/or remove smokiness.
Aquamarine Heating Routine To remove yellow in order to produce a purer blue color.
Beryl Irradiation Routine To create blues and yellows from colorless stones.
Diamond Laser Drilling

Fracture Filling

Irradiation

HPHT

Coating

Occasional

Occasional

Routine

Occasional

 

Occasional

To bleach out dark inclusions.

Filled with chemicals sharing the same refractive index of diamonds.

To make existing colors more intense or induce new colors.

To change brown diamonds to whites, yellows, greens and some pinks.Can make all colors but primarily used to make pinks

Emerald Oiling

Impregnation

Routine

Occasional

Colorless oil is used to penetrate into surface reaching fractures making them less noticeable.

High-grade epoxy resins can be used to fill the surface reaching fractures to make them seem less noticeable.

Jade Bleaching

Impregnation

Dyeing

Occasional

Occasional

Occasional

To remove any dark discoloration.

With colorless wax, to improve appearance.

To imitate natural colors.

Opal Assembledproduct

Impregnation

Routine

Routine

Usually opal doublets can be made by combining via epoxy, a thin layer of opal backed by either chalcedony or boulder rock.

Impregnated with colorless resins and hardeners.

Pearl Bleaching

Dyeing

Irradiation

Routine

Routine

Occasional

To remove discoloration.

To improve color.

Certain pearls can be subjected to irradiation to permanently alter their color to gray, black or blue.

Quartz Heating Routine To improve color.
Ruby Heating

Cavity Filling

Diffusion

Routine

Occasional

Routine

To intensify or lighten color.

Surface cavities are filled with foreign material (sometimes glass).

To produce an artificial star on a natural stone.

Sapphire Heating

Diffusion

Irradiation

Routine

Routine

Occasional

To intensify or lighten color.

To produce an artificial star on a natural stone.

To obtain yellow or orange color from colorless stone.

Tanzanite Heating Routine To produce the violet-blue color for which the stone is known.
Topaz Irradiation

Heating

Routine

Routine

To create blue, yellow and green topaz.

To create pink or red topaz.

Tourmaline Heating

IrradiationCavity

Filling

Routine

Occasional

Occasional

To improve intensity for blue-green colors.

To intensify pink, purple and red colors; blue tourmaline can be irradiated to purple.

Hardened colorless substances are often used to fill cavity.

Zircon Heating Routine Brown zircon is heated to make red, blue and white zircon.
Smaller sizes below 1.5mm are difficult to find in gemstones but can easily be sourced in

Yellow Diamonds | Blue Diamonds | Irradiated Pink Diamonds | Loose Colored Diamonds | Fancy Intense Yellow Diamond | Birthstones | Enhanced Diamonds | Canary Yellow Diamond

Green Diamonds | Black Diamonds | Chocolate Diamonds | Purple Diamonds | Pink Diamonds | Red Diamonds | Blue Diamonds Rings