To distinguish the authenticity of a crystal cup, one can start from the following aspects:

**Refractive effect: Place the crystal cup under light, and the real crystal cup will exhibit strong refraction and refraction effects. The light will jump inside the cup body, producing a brilliant glow; The refraction effect of fake crystals or ordinary glass cups is weaker.

**Bubbles and impurities: There are almost no bubbles inside the real crystal cup, with very few impurities and extremely high transparency; False crystals or inferior glass cups may have obvious bubbles and impurities.

**Cutting and polishing: The cutting and polishing of the real crystal cup are very fine, with smooth edges and no burrs; The cut and polishing of the fake crystal cup may not be precise enough, and there may be flaws on the edges.

*Marking and Identification: True crystal cups usually have brand identification or origin information, which can be checked to determine authenticity; And fake crystal cups may not have these markings, or the markings may look rough.

**Knocking sound * *: Gently tapping the crystal cup, the real crystal cup will make a crisp and pleasant sound, while the sound of the fake crystal cup appears dull.

**Price Comparison * *: The price of real crystal cups is usually much higher than that of ordinary glass cups. If the price is exceptionally low, it is likely that it is not a real crystal cup.

**Professional appraisal: If none of the above methods can determine the authenticity, you can seek professional institutions or experts for appraisal.

It should be noted that there are some high imitation crystal cups on the market that may be difficult to distinguish in appearance. Therefore, it is best to choose reputable merchants and request relevant quality certificates when purchasing.