The greater number of ancient Mexican jadeite beads appear to have been rounded pebbles of this material, assorted as to size and drilled for use in making necklaces. Other green stones used at this time in Mexico were green jasper, green plasma, serpentine and also the “Tecalco onyx” or “marble” above mentioned. In many cases these substances are of such rich green that they might easily be mistaken for jadeite by those who lacked the tests or the experience at the command of modern mineralogists. Should jadeite ever be found _in situ_ in Mexico, it seems probable that the discovery will be made in the State of Oaxaca, whence came the finest ancient specimens, including the splendid votive adze. Moreover, one of the few materials by which jadeite can be worked is furnished by the streams of this region, whence have been taken several rolled pebbles which the writer has identified as yellow and blue corundum, the quality being equal to that of specimens from Ceylon.[380] Gesner describes one of the lip ornaments worn by the aborigines of South America in the following words:[381] A green stone or gem which the inhabitants of the West Indies use. They pierce their lips and insert this stone so that the thicker part adheres to the hole and the rest protrudes. We might call these ornaments _oripenduli_ [mouth-pendants]. This stone was given me by a learned Piedmontese, Johannes Ferrerius, and he wrote of it as follows: “I send a cylindrical green stone, as long as a man’s middle finger, and having at one extremity two ridges. It is stated that the Brazilians of high rank wore these, from their youth, in their pierced lips; one or more being worn according to the dignity of the wearer. While eating, or whenever they so wish for any other reason, these ornaments are removed from the lips.” Similar ornaments, made of a green quartz and of beryl, are in the Kunz collection in the Field Museum of Chicago.