Always helps to have good lighting, and excellent magnification- like a lighted Jeweler's loupe.

If it is a Bead that is Popular and Expensive you know it is most likely Faked a LOT and so be very cautious and skeptical.

People Misrepresent Beads a Lot and Not always on purpose.

I have some of those Beads also- the Resin ones- and they are an affordable alternative for Jewelry Makers that like the Look and the Style.

As you probably know, the Agate/Calcedony dZi beads are being artificially aged and put through some type of roller that produces circular and crescent surface marks. These marks occur naturally when glass and stone beads, or marbles, are hit by another bead or similar and receive surface fractures over time.

Good luck in your Bead Collecting. Luckily there are many Generous and Knowledgable Bead Lovers, Collectors and Researchers in this Forum. I am always learning here, and grateful.

Holiday Best Wishes, and Happy New Year!

Anne