鸳鸯锁胭脂扣
[yuān yāng suŏ yān zhī kòu]
'鸳鸯锁' is a special kind of lock often given as a gift in ancient China to express a strong and eternal vow between two lovers; '胭脂扣 (Yān zhī kòu)', a traditional hair ornament, carries connotations of beauty and elegance typical to classic romance literature. So it suggests the combination of loyalty, romance, and elegance.