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silver bangles design What is the discoloration of gemstones during wax setting?

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The first situation occurs mainly because some gemstones are not suitable for wax setting casting. Gemstones with developed fissures are likely to change color after being subjected to high temperature and thermal shock. Some gems (such as amethyst, blou topaas, sitrien, ens.) are unstable in color when exposed to heat, so this type of gem is not suitable for casting with wax. To determine whether a gemstone is suitable for wax setting casting, you can first test the gem’s heat resistance and the gem’s ability to withstand thermal shock. The color of gemstones whose color is improved artificially is generally unstable, and the color will change or fade after heating. Dus, wax setting casting is also not suitable for this type of gemstone. In addition to the nature of the gem, the mold temperature is also one of the important reasons for the loss of color of the gem. Excessive mold temperature or metal casting temperature will have a serious impact on the safety of gems during the casting process. Most gems have an extreme temperature, beyond which the color and even the crystal structure of the gem will change. Dus, the mold temperature and metal casting temperature should be reduced as much as possible during the wax inlay casting process. In terms of waterline setting, full consideration should be given to the flow rate. A waterline larger than that of conventional jewelry casting should be adopted. The circular cross-section waterline is preferred, and the auxiliary waterline is combined to increase the flow rate.

 

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