To determine whether a watermelon is a crystal melon, you need to consider the following aspects:

1. Appearance characteristics: Crystal melons usually have a smooth skin and may be lighter in color, showing A translucent texture. They may look clearer and have a certain sheen.

2. Tapping sound: Tap the watermelon with your fingers and listen to the sound it makes. The sound of crystal melon is usually crisper and has better reverberation.

3. Weight and size: Crystal melons are relatively light in weight and may be relatively uniform in size.

4. Pulp color and texture: After cutting the watermelon, observe the color and texture of the pulp. Crystal melon flesh is usually lighter in color and may have a finer texture.

5. Taste and taste: Tasting the texture and taste of watermelon is also an important basis for judging whether it is a crystal melon. Crystal melon is generally considered to be sweet and juicy.

However, it should be noted that there are many varieties of watermelon, and different regions may have different names and characteristics. Therefore, appearance or some characteristics alone cannot completely determine whether a watermelon is a crystal melon.

The most accurate method is to consult an experienced melon grower, fruit merchant or professional agricultural expert. They can give more accurate judgments based on actual observation and experience.

In addition, it is also important to choose reliable channels and suppliers with good reputations when purchasing watermelons. They may provide more accurate product information and warranties.

In any case, when choosing watermelon, the most important thing is to choose according to your own preferences and needs. Appearance, sound, weight, etc. are just some reference factors, but the final judgment must be based on personal taste and understanding of watermelon.

If you have other comments on this article, such as if you want me to further describe the characteristics of crystal melons, or if you want to know how to choose sweet watermelons, you can tell me and I will do it based on your suggestions. Ask for improvements.