They were bought as a birthday present for Sonic the Hedgehog. I don't think it's real acrylic. They are made of plastic and form small, opaque white chips with minimal handling. They didn't have a large cut compared to more expensive glass gems. BUT they were also much cheaper. If I did it again I would buy a very nice glass block for each child. I think my set is about $1.80 per child for glass stones and then I would buy a ten dollar package of gems. 150 packs. I can't tell if the quality is better or not on this one, but it's mostly clear plastic, so I'd probably risk something cheaper than this for a gem "pen".
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