The shankha shell is sacred in Hinduism and is used as a ceremonial trumpet and is sounded during worship. The warriors of ancient India, Hawaii, and the Maya cultures also used trumpets of conch shell to announce battle.
In the jewelry world, conchs are used for cameo carvings, scrimshaw and beads. Conch can produce "pearls," though not of the nacreous variety. Conch pearls range in color from white to pink, brown and even deep purple or black. The pearls are not nacreous like other mollusks, but have a chatoyance to them that is created by the fibrous crystals of calcium carbonate used to coat an irritant just like an oyster or mussel would do with nacre. Since the conch doesn't produce nacre, but calcium carbonate instead, the long fibers give the illusion of "flaming," which is what the chatoyancy is called. Because only 1 in about 100,000 conch produce pearls, they are very valuable and command a high price.
This shell necklace & earrings set by DeLane Cox features shells that have been cut to show the inside, plus freshwater pearls, peridot chips, and shell pieces, all set in 14k gold-filled wire.