The Aztec word for jet is teotetl. They have a bit of weight to them, and are some of the fanciest girlie plugs I've seen for a while. The style was inspired from some old Malay plugs, though I've seen a similar design crop up both in traditional Balinese women's plugs as well as a few Javanese pieces. They are made in North Thailand, and have a polished finished, set with CZ's, rubies, and emeralds. I sometimes call them belly dance earrings -many of them have little bells on the bottoms.
Most pairs are smaller, with no upper hook.
Sterling silver Indian hoop style earrings are shown above. Gold earweights from south India, are available. Though not marked, 22K is the traditional standard of gold in these regions. After removing this screw, the top crescent opens up on a hinge to allow the weights to be hung on the lobes. They are probably filled with lac to prevent the high karat, soft gold, from getting crushed from use.