Oil injection treatment of emerald :
In order to ensure the yield of finished products, oil is often injected before cutting during processing. Oil injection treatment is to inject a special grease into the cracks of the emerald, which can not only reduce the existing cracks or cracks in the emerald. holes, and can also improve the transparency and brightness of emerald and enhance its aesthetic value.
"Colorless oil" and "colored oil" treatment:
Oil injection treatment is a common optimization method on the market for emeralds. There are two common types of colorless oil and colored oil. Colorless oil does not change the color of the emerald itself and does not damage the structure of the emerald, which is an optimization category. However, colored oil will change the color of the emerald itself and is a treatment category.
Colorless oil injection is to inject a special oil into the cracks of the emerald, thereby making the cracks in the emerald look less obvious, improving the clarity of the emerald and making it more beautiful, so this colorless oil injection The method will be recognized by the international jewelry industry and is an optimization.
Colored oil injection will add a dye to the injected oil. After the oil is injected into the emerald, it not only changes the clarity of the emerald, but also changes the color of the emerald itself. Since this method contains chemicals that greatly change the properties of the emerald itself, its value will be greatly reduced, so it is not recognized and is considered treatment.
How to identify emerald treated with colorless oil:
You can immerse the emerald in water and slowly rotate the sample with reflected light to observe. The colorless oil in the cracks will produce interference colors. You may also see irregularly distributed oil traces, which are more reflective than liquid inclusions in general fissures. You can also check whether it "sweats" after being heated. Use a desk lamp or hot needle close to the sample. Oil will seep out from the cracks after being heated. You can see if there is oil seeping out by wiping it with tissue paper or lens tissue.
The identification method of emerald injection with colored oil:
is similar to the identification method of injection with colorless oil introduced before, but in addition, during magnification inspection, green oil can be seen distributed in filaments along the cracks. After the colored oil dries, it will still be in the cracks. Leave the green dye behind. When doing a hot needle test, the oil that oozes out when heated or the oil stains on the packaging paper turn green. Ultraviolet detection can also be used to assist in identification, because some colored oils will show fluorescence characteristics under ultraviolet light.
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