Holly Holley Blue Agate Chalcedony Cabochon ITEM # hbac1. This is very rare gemstone material. It is always hard to find good quality raw rough stone that will cut into cabs this pretty. The rough stone is only found in one location in Oregon and collecting any of it now is not allowed. This cab shows very pretty light lavender purple color, VERY GEMMY .. it is a super nice little gemstone. It is polished to a very high gloss on the front and sides and the back side too. It measures about 17.7 x 10.3 mm by 4.8 mm thick. This cab should make you a WONDERFUL piece of jewelry ! You will LOVE this little cabochon. I have an American Quarter (25 cent) coin in one of the pictures to help you understand the size.