◎ Tridacna is a rare organic gemstone, white as jade, and also a sacred object of Buddhism. Tridacna is the largest marine shell, with a diameter of up to 1.8m. The name Tridacna began in the Han Dynasty. Because there are radial grooves on the surface of the shell, which look like ancient ruts, it is called Chequ. Later generations added stone characters beside the car canal because it was as hard as a stone. Tridacna, pearl, coral, and amber are known as the four organic gemstones in the West. In Chinese Buddhism, gold, silver, colored glaze, agate, pearl, and amber are revered as one of the seven treasures.
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