Grape Agate is the name given to the botryoidal Purple Chalcedony that has been recently discovered in Indonesia. So far there has been only one locality found, making this an extremely rare and valuable stone. Colors range from dark purple to a light lilac or lavender. Very rarely green colored specimens are found amongst a purple vein, and even bi-colored green and purple pieces have been found! These are amongst the rarest, as they’re truly the definition of “Grape Agate”.