A geode d20 die, it's a black and grey marbled "rock" with a sparkly white interior, and the "crystals" in the center are lavender glitter with a green colorshift. It looks hollow but it's filled with clear resin on top of that, so the entire die is solid resin with a miniscule layer of paint and glitter inside It's not sanded smooth or inked yet so the numbers are hard to see, and there are 2 small bubbles on the 20 face, but all that will be fixed in time
https://6-28.mastodon.xyz/media_attachments/files/112/555/253/513/834/194/original/8fbfc340669a77a5.jpg