Old fishbone belongs to high-grade Wan Wen jewelry. Old fishbone, also called old mother-of-pearl and mother-of-pearl, is made by grinding seashells. Its texture is delicate and moist, and its interior reflects colorful mussel light, which is very beautiful. In the eyes of Tibetans, old fishbones are regarded as more precious jewels than corals, pearls, beeswax and turquoise. Because it is rarely handed down from generation to generation, most of them are handed down from generation to generation by the guru or Lama, so Tibetans cherish it very much. Therefore, the old fishbone belongs to high-grade Wan Wen jewelry. Wan Wen jewelry can be worn or played with, which is the condensation of great things and the conciseness of freehand brushwork. As the saying goes, "small things are like big things." They are the "materialization" of cultural spirit, and are closely related to their owners through years of washing, which not only preserves their bodies, but also shows their charm and taste.