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Requirements for wax inlay casting of precious stones

An important index to measure the effect of wax setting is the stability of gemstones. After wax inlay casting, the gemstone can't be discolored, cracked or broken. In the process of wax embedding casting, gemstones must withstand the thermal shock of high-temperature molten metal during high-temperature baking and pouring, so it is required that gemstones must be able to withstand quite high temperatures and have a certain ability to withstand uneven heating and cooling. This puts forward specific requirements for the types and quality of gems. If a gem is cracked or sensitive to temperature and thermal shock, it may be cracked after wax inlay casting. However, when using gemstones whose color has changed after heat treatment, wax inlay casting may have negative effects, affecting the appearance and color of gemstones. In addition, in this complicated process, there are many influencing factors, and the influence of any one factor may cause the gem to crack or change its appearance, so wax embedding casting always has risks.

By classifying the applicability of various commonly used gems to wax setting technology, gems can be roughly divided into two categories: those suitable for wax setting and those not suitable for wax setting.

Gems suitable for wax inlay casting

If the quality of gemstones can be well controlled and the technological parameters of casting process can be correctly controlled, good results can be obtained after wax inlay. This kind of gem includes diamond, ruby, sapphire, garnet, olivine, emerald cubic oxide and so on.

Gems not suitable for wax inlay casting

Gemstones are not suitable for wax inlay casting, such as opal, amethyst, topaz, topaz, pearl, amber, coral, turquoise, etc.