Rhododendron is a rare organic gem, as white as jade, and pure white is the best in the world. Among the seven treasures of Buddhism "turtle, gold and silver, agate, coral, coloured glaze and amber", turtle is the strangest and rarest gem, because it comes from the deep sea of the Indian Ocean or the Pacific Ocean, or a small part of it is little known because of the crustal orogeny, so its output is very rare and precious. At present, the largest natural sea pearl (the Pearl of God) among the world-famous pearls weighs 6350 Baker, which is produced by dragonflies! ? Basic characteristics of Trionyx sinensis: From the gemological point of view, only pearls with pearl luster, white color, halo and delicate texture can be used as gems, but Trionyx sinensis is the most beautiful of all shellfish products. ?

The chemical composition of 1. Rhizoma Dioscoreae Septemlobae contains 86.65% ~ 92.57% calcium carbonate, 5.22% ~ 1.2 1% water and 0.69% ~ 0.97% water. In addition, it also contains trace elements and 10 amino acids; ?

2. Construct a layered structure of minerals, mainly aragonite, which has the same characteristics as pearls. The shell is bright and clean, and colorful light can appear in the sun; ?

There are two colors: white, ivory and brown. Sandfly is praised by Buddhists as the purest white in life, so it is highly respected by Buddhists. It is the largest marine shell with a diameter of1m. The shell is white and smooth, the shell is yellow and brown, and the beads cut and ground at the end have wheel grooves, hence the name. The ancients also made round beads from white corals and generally thicker shells, which were regarded as dragonflies. It can be seen that cockroaches were deeply loved by people in ancient times. According to the "Jingangding Yoga rosary sutra", using rosary can gain double merits. Among Buddhists, monks use it as a prayer bead. Among the official hat beads in Qing Dynasty, it is the jewel in the crown of the six officials, which shows its extraordinary value.

The surface texture of snail beads is fine, representing its growth years in the deep sea, and its luster is delicate, so it is regarded as genuine. The fake tortoise shell is white and dull. It is made of waste powder from processing real tortoise shells and then pressed by a machine, which is considered as an imitation.