1. Diamond necklaces and rings had been beautifully arranged on a background of black velvet.
    金刚钻项链和戒指华丽地布置在乌黑的丝绒上.

2. Diamond necklaces and rings had been beautifully arranged on a background of black velvet.
    钻石项链、戒指漂亮地陈列在黑色丝绒上面。

3. She is wearing a black velvet dress.
    她穿着一件黑色天鹅绒连衣裙。