Another desirable effect is something called "Nāga skin" which refers to tiny circular weathering marks on the surface of the bead that resemble scales.
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The antique Pyu and Phumtek beads of Burma are also similar in some ways to dzi: they share some of the dzi bead patterns, but instead of agate, the Phumtek are generally made from petrified opalized palm wood, while Pyu beads are often made of red or orange carnelian with some thin white alkali-etched lines.