by eClarity | Apr 7, 2018 | Uncategorized | 0 comments Lapis and turquoise are prime examples of opaque coloured stones that are marketed both as gems for jewelry and as ornamental materials. Photo: Archivo Iconografico, S.A./Corbis, Christie’s Images Inc. Courtesy: GIA. Resource: Amanda. #eClarity Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.