Some of the most incredible Southwestern and Indian jewelry is made with Spiny Oyster beads. The colors of these beads vary from pink to purple and from light to deep orange. Spiny oyster beads come from the spiny oyster shell, or Spondylus, harvested from the Sea of Cortez, Baja California and Mexico. Different types of Spondylus may also be found in the warm waters off the coasts of Central and South America. Spondylus is Latin for “spines on its back,” which is appropriate for this beautify and difficult to harvest shell.
It was hard to find information about just the beads, but I did find out about the Spiny Oyster Shell from the Wikipedia. “Spondylus is a genus of bivalve mollusks, the only genus in the family Spondylidae. As well as being the systematic name, Spondylus is the most often used common 
name for these animals, though they are also known as thorny oysters or spiny oysters.There are many species of Spondylus, and they vary considerably in appearance and range. They are grouped in the same super family as the scallops, but like the true oysters (family Ostreidae) they cement themselves to rocks, rather than attaching themselves by a byssus. Their key characteristic is that the two parts of their shells are hinged together with a ball and socket type of hinge, rather than a toothed hinge
as is more common in other bivalves. Spondylus have multiple eyes around the edges of the shell, and they have a relatively well developed nervous system. Their nervous ganglia are concentrated in the visceral region, with recognizable optic lobes, connected to the eyes. Spondylus shells are much sought after by collectors, and there is a lively commercial market in them.Archaeological evidence shows that people in Neolithic Europe were trading the shells of Spondylus gaederopus to make bangles and other ornaments as long as 5,000 years ago (Varna necropolis). The shells were harvested from the Aegean Sea but were transported far into the centre of the continent. In the LBK and Lengyel culture, Spondylus shells from the Aegean Sea were worked into bracelets and belt-buckles.
Spondylus princeps are also found off the coast of Ecuador, and have been important to Andean peoples since pre-Columbian times, serving as offerings to the Pachamama as well as some kind of currency. In fact much like in Europe the Spondylus shells also reached far and wide as pre-Hispanic Ecuadorian peoples traded them with peoples as far north as present-day Mexico and as far south as the central Andes. The Moche people of ancient Peru worshipped animals and the sea and often depicted Spondylus shells in their art.
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*Parts have been reprinted from the Wikipedia.
