quartet
n
1 (piece of music for) four players or singers 四重奏(曲); 四重唱(曲); 四重奏演奏者; 四重唱演唱者
a string quartet, ie players of or music for two violins, a viola and a cello 弦乐四重奏(两个小提琴、 一个中提琴和一个大提琴的演奏者或其乐曲).
2 set of four people or things 四人一组; 四件一套
a quartet of novels with a linking theme 主题连贯的四部小说.
You were very kind. You brought out all your jewellery and you told me I could take anything I wanted. There were so many beautiful things that it was hard to choose. And then I saw a lovely diamond necklace with a big blue stone in the centre.