Here's some more information about heat treatment of Jade, particularly to create red jade.
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National jewelry jade standard, except for cutting and grinding and polishing will be used to improve the appearance of jewelery (color, clarity or special phenomena), durability or availability of all methods called optimization (enhancement). Including optimization and process two categories.
Optimization (enhancing): refers to the traditional, widely accepted to make jewelery out of a potential US display optimization approach. About optimization methods include: heat treatment, bleaching, dip wax, dip a colorless oil, dyed (except outside chalcedony jasper, agate class) and so on.
Treatment (treating): refers to a non conventional, not being accepted optimization methods. Include: Dip colored oil, filling processing (glass filling, filling plastic or other hard materials such as polymer filling), dipped wax (turquoise), stain treatment, irradiation, laser drilling, film processing, surface diffusion processing and so on.
Heat treatment method of gem is an irreversible way, after heat treatment gem further changes will not happen again in the transparency and color. Therefore, the national standard in the jewelery belonging to the heat treatment method for optimizing category gem stone, gem stone artificial treatment method that people can accept.
Fei color jadeite mineral layer was observed under the microscope quality gap is filled with gelatinous substance limonite
Emerald-colored layers of red Fei (Central) colloidal mineral limonite gap is concealed, it is relatively transparent
Fei jadeite jade color is due to the gravel surface disseminated by the mass of secondary iron oxides and appear yellow or brown maroon, known as the "red mist layer" in wool, often appear in emerald wool near the surface (Figure 1), is dominated by some of the gelatinous substances limonite (FeO (OH) · nH2O) penetrate into jadeite jade minerals and micro-fissures caused by the gap (Figure 2), as limonite is a gum appeared to cover up the emerald gaps and fissures between the presence of mineral jadeite, and makes the site Fei color often seem transparent than other parts of the emerald, round number (Figure 3). However, the general Fei emerald color often with taupe color tone, color, dark, not bright. So, people will take advantage of the heat treatment method, by heating, so that the dark emerald green jade color becomes bright red tan brown, make colors more vivid and beautiful, this is the "red-hot" Jade.
( and the most handsome cat too .. I know u are nearby Mochi haha ) 
