The iridescent shimmering lining of certain shells is known as the Mother of Pearl, it is so named as it is used to seed cultured pearl. Asian craftsmen for wood inlay boxes and carvings, also being worked into rings, pendants and earrings, have favoured it. For intricate style jewellery the inside colours of the shell are best and these can make lovely, shimmering pieces. These can then be saw pierced to the shape wished.