Collectible silver rings 1- Royal silver ring with rare Yemeni green agate 2- Silver ring, Baqili Yemeni craftsmanship, with agate of unknown type 3- Silver ring with green stone of unknown type 4- Royal silver ring with black agate that shows red strongly and has a white vein, its origin is unknown, Yemeni or otherwise Their sizes are approximately between 6 and 7.