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Melo Melo pearls are extremely rare and come not from an oyster or mollusk but instead from the Melo Melo marine snail, which is found in the waters of the South Chine Sea and the Bay of Bengal. Like conch pearls, the Melo Melo gem is not actually a pearl because it contains no nacre. They can be extremely large and are generally very round. The colors range from tan to dark brown. Orange is the most desirable color.

This is an interesting article
http://www.giathai.net/lab_field_reports_VP03.php

Melo melo pearls are extremely rare. Although researchers are attempting to culture them, none have yet succeeded -- so all melo melo pearls are natural. Although these pearls have been known and collected in Asia for many years, they have only recently been introduced into the West.

http://in.88db.com/bangalore/html/images/articles/lifestyle/Beauty.html