The most common sapphire on the market is glass. In fact, it is relatively easy to identify glass. Glass is shaped at high temperature, naturally shrinks after cooling, and the plane is concave inward. This kind of depression is not easy to find with the naked eye, so a magnifying glass must be used. When using a magnifying glass, you can't focus in a straight line, but focus obliquely, so it is easy to find the concave surface. The concave surface is usually glass. The polishing of precious stones usually achieves a very flat effect. Another identification method is that there are many kinds of inclusions in glass, the most common one is bubbles, while gems have no bubbles. Bubbles in glass can be found with a magnifying glass of 10 times.

There is also a sapphire that acts as a synthetic sapphire. The identification method is to first look at the texture and whether the texture structure is naturally crystallized. Rock crystal is often messy, so it is generally genuine. However, the crystallization of synthetic sapphire is often very orderly. Of course, many synthetic sapphires are clean and flawless, usually fakes. Because there are always some impurities in natural gems, there are almost no clean ones. This synthetic sapphire is often dazzling in color and superficial in luster, without the deep feeling of natural color. Natural gemstones are high in color purity, not dazzling, and their brilliance is naturally emitted from the inside out.

It is best to observe sapphire with naked eyes under white light, not with strong light, because the blue color seen with naked eyes under white light is the most correct. High-quality sapphire should be transparent. When you turn the polished sapphire, you can see dancing blue light. It is best to buy sapphire without cracks and defects, and sapphire with obvious cracks is of little value. From the color point of view, purplish sapphire in indigo is the most precious.

In addition, if buying sapphire jewelry is particularly expensive, it is best to ask for an appraisal certificate, which is a common practice in the international jewelry industry.