Girls can wear diamonds, but they can't, because diamonds are a very hard material with high hardness and wear resistance. Girls wearing diamond jewelry may have the following problems:

1. Safety: The hardness of diamonds is very high. If you accidentally touch a hard object or get hit, it may cause diamond jewelry to be broken or damaged, causing injuries.

2. Problems in daily use: Dust, grease and other dirt are easy to accumulate on the diamond surface, which needs to be cleaned and maintained frequently. However, the time and energy for girls' daily activities and jewelry maintenance may be limited, and it is difficult to do detailed maintenance.

3. Value: Diamond is a very precious gem. Wearing diamond ornaments may cause unnecessary concern and jealousy and increase property safety risks.

Therefore, although diamond is a precious gem, it is not a wise choice for girls to wear diamond ornaments. Girls can choose other materials, such as platinum, gold or other precious stones, which are more suitable for daily wear and easier to maintain.