Observation with a dichroic mirror. Since most synthetic products are produced by the Werner Ye method, the crystals synthesized by this method will split along a long axis due to the release of internal energy, and most of the finished gemstones will be parallel to the light. sapphire crystal glass watches Therefore, the dichroism of synthetic products can be seen from the table surface direction: while natural products are cut and polished, the table surface is usually perpendicular to the optical axis, and it is generally difficult to observe dichroism from the table surface.

Enlargement inspection is the most distinguishing significance. Natural products have various mineral inclusions, and synthetic products have unique internal characteristics. For example, synthetic products produced by the Werner leaf method have curved growth lines. Its shape is like the spiral pattern of a record, and it has iconic features such as bubbles; the synthetic product produced by the flux method has inclusions such as platinum flakes, plumes, and flux droplets, but it is more difficult to observe; the hydrothermal synthetic product There are alloy inclusions, nail inclusions, jagged, wavy, dendritic inclusions, etc.; many composites are clean and flawless inside.

Large-scale instruments such as infrared spectroscopy, Raman spectroscopy, etc., can test the composition of gems, so that natural products can be distinguished from synthetic products.

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