Amazing Natural grape agate chalcedony crystal gemstoneGenuine grape agate gemstone 89. 7mm long x 55mm wide x 52mm tall , this is the exact stone you will receive 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