The following is the introduction of colored beads (dzi beads) by foreigners:

Sezhu (Tibetan: gZi)

Onyx is called "Ser" in Tibetan, and is often used as a talisman to resist all kinds of evil spirits. Color beads can often be found near ancient tombs or newly reclaimed farmland. It is said that Sezhu originated in prehistoric times, and there are many myths and legends about Sezhu. Color bead is a kind of creature or insect. When people see or touch them, they become petrified. Another view is that colored beads are gems thrown down by the gods. Whenever jewels are broken or broken into pieces, the gods will throw them away. There is also a saying that colored beads are the fruits of wishful trees in the sky; It fell out of the mouth of the legendary golden-winged bird; Or the legendary Tibetan Hero Ridge? The scattered treasures plundered by King Gelsall from the treasures of the Persian kings.

Color beads are generally divided into two categories: one is barrel-shaped onyx with brown or black stripes and round "eyes" or rings on it. The other is all kinds of round chalcedony or light chalcedony with spiral ochre, white or gold stripes. According to the shape, color beads can also be divided into slender cone-shaped "mother" color beads and thick barrel-shaped "male" color beads. The most respected pearl is a barrel-shaped brown or black onyx with a nine-year-old white "eye" and an angular pattern similar to a character in the white eye. Nine eyes are very rare and expensive. In Tibet, the transaction price of nine-eye pearls is equivalent to the price of a medium-sized home or a few kilograms of silver ingots.

Since the third century BC, the technology of etching chalcedony, chalcedony and opaque agate may have been used in vast areas during the Indus and Tigris rivers. Draw a pattern on a cylindrical stone with a reed pen or brush dipped in strong soda water. When dry, bury the stone in hot ash and bake it for a while. After the stone is cooled and cleaned, the glazed white pattern will remain on the dark stone or the white pattern will infiltrate into the dark stone and turn white. Then it is etched with copper nitrate solution until a black pattern appears on the white background. The earliest bead pattern may have stripes or five stars. The first-class stone is not cut through, the pattern is deeply hidden in the stone, and the stone should be smooth and shiny.

Color beads were copied in large quantities in the last century. At present, porcelain beads, plastic beads, resin beads, yak horn beads and glass beads have been replicated in India, Nepal, China and Tibet. Taiwan Province Province has now produced the best imitation, using the original fire etching process.

Sezhu originated in Tibet, so it does not have the characteristics of gems and similar objects of Indian Buddhist gods. However, when describing the God of Bognis, the colored beads are often mentioned.