1, Boucheron: Boucheron is a French jewelry brand with a long history, which enjoyed a high reputation from the end of 19 to the beginning of the 20th century. Due to management and marketing strategies, brands have gradually lost market share.

2. Coronet: Coronet is an American jewelry brand, which was founded in19th century and was very popular in the middle and late 20th century. Due to fierce market competition and brand positioning, constance gradually withdrew from the market.

3. George Zhan Sen: George James is a Danish jewelry brand, which is famous for its unique design and craftsmanship. Due to poor management and changes in market demand, the George James brand gradually disappeared.