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Shell is a hard mineral which is the outer layer covering some creatures found in water. Shells are inexpensive materials that can be used in jewelleries, cameos and different decorative objects.
There are various types of shells and one of them is sea shell which is one of the most ancient materials used for ornaments. People used to string the shells into a necklace or hang them as a pendant. Another type is known as mother of pearl which is a 2 layered shell with a pearl in between them.