诞生石

例句：

1. 1. She chose a birthstone asa gift for her friend's birthday.
   她选择了一个诞生石作为朋友生日的礼物。
2. 2.The birthstone for the zodiacsign of Cancer is the moonstone.
   水瓶座的诞生石是月光石。
3. 3.Birthstones are often associated with specialmeanings and are believed to bring goodluck.
   诞生石通常与特殊的意义相关联，并被认为会带来好运。