Heat treatment

The purpose of heat treatment is to lighten the color of dark purple products by heating; Remove the smoky color tone; Heat amethyst to transform it into yellow and green crystals; Heat certain smoky crystals to transform them into yellow water with a green hue. Generally, crystals improved by heat treatment have stable color, are difficult to detect, and have been widely accepted by people.

Irradiation

The purpose of irradiation is to produce purple products after yellow crystal irradiation; Colorless and light colored crystals are irradiated to produce smoky or yellow colors, and subsequent heat treatment can reverse the process; After irradiation, the color of hibiscus stone can be deepened. The color of gemstones treated with irradiation is very stable and difficult to determine.

Dyeing

Dyeing treatment mainly adopts the method of quenching and explosion, immersing lighter colored crystals with pink or other colored dyes into the cracks to dye various colors. By zooming in, it can be seen that the color is distributed along the cracks or explosion cracks, and abnormal fluorescence of the dye can be observed under UV light.

Filling treatment

Filling treatment is the use of resin and other materials to fill the surface voids and cracks of crystals, in order to improve their appearance and durability. By zooming in, differences in surface gloss can be observed, and occasional bubbles can be seen in cracks and voids. There is a "flash effect" observed along the cracks. Infrared spectroscopy can detect the absorption peak of the filling material.

Film coating treatment

The crystal treated with film coating has colorful iridescence on its appearance, which is easy to identify with the naked eye. Some crystals are covered with a blue reflective film on their surface, resembling moonstones in appearance. It can be identified by abnormal surface gloss and different refractive indices. In addition, sometimes the thin film detachment can be seen during magnification inspection, and characteristic peaks of the film layer can be observed through infrared spectroscopy testing