This is a fabulous stone for a pendant, a ring, or as a collectible stone. This comes from Mexico, and a similar material is mined in Botswana and is called Botswana agate if it is from there.
This gemstone weighs 12.53 carats and measures 19.73 x 11.62 x 5.73mm deep. It is a great size for jewelry in any application.
Agate is very hard at a 7 on the Moh's scale so it will last a lifetime in jewelry.
This auction is 24 hours long so bid now if you are interested- it will be over before you know it!
Minimum starting bid is 4BTC and minimum bid increment is 1BTC
Good luck!