platinum group of matals

例句：

1. 1. The platinum ring is the most expensive piece of jewelry I've ever seen.
   铂金戒指是我见过的最昂贵的珠宝。
2. 2. The platinum group of metals is used in many industrial processes.
   铂金合金用于许多工业过程。
3. 3. This platinum necklace was given to me by my grandmother for my birthday.
   这条铂金项链是祖母在我生日时送给我的。