Striped Dzi (Chong-Dzi)

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This is a Ancient Tibetan Two-striped Chong-Dzi.long 4.5cm.It's has many blood spots.
The Dzi with striped motifs are called "Chong Dzi".
They come in different designs-single-striped,two-striped,three-striped,four-striped,so on and so forth.
They come in different shapes-straight,curvey and crescent.