A thin layer of polished metal placed under a displayed gem to lend it brilliance.
A thin layer of polished metal placed under a displayed gem to lend it brilliance.
衬箔在展出的宝石下放置的用以衬出其光泽的薄层剖光金属
A thin layer of polished metal placed under a displayed gem to lend it brilliance.
衬箔在展出的宝石下放置的用以衬出其光泽的薄层剖光金属