The name Crystal in Chinese / Japanese...

This word means “crystal” such as fine crystal glassware or diamonds in Chinese, Japanese, and Korean Hanja.

水晶 is a cool selection if your name is Crystal, as it will match your name by meaning (rather than pronunciation).

It's also cool because it will universally contain the meaning of your name in most Asian languages.

This is a common transliteration to Mandarin Chinese for the names Crystal or Krystal.

Consider also going with the meaning of crystal. The characters shown to the left sound like crystal in Mandarin but do not mean crystal (of course, the word for crystal in Chinese does not sound at all like the English word crystal).

This is another transliteration to Mandarin Chinese for the names Crystal or Krystal.