Pearl or parasite enters a bivalve mollusk and settles inside the shell. The mollusk, irritated by the intruder, forms a pearl sac of external mantle tissue cells and secretes the calcium carbonate and conchiolin to cover the irritant. This secretion process is repeated many times, thus producing a pearl. Natural pearls come in many shapes, with perfectly round ones being comparatively rare. Typically, the build-up of a natural pearl consists of a brown central zone formed by columnar calcium carbonate (usually calcite, sometimes columnar aragonite) and a yellowish to white outer zone consisting of nacre (tabular aragonite). In a pearl cross-section
Pearl and the Puppets the Pearl & The Puppets name, but under her own name. In 2008, the band's song "Because I Do" was featured on a Vodafone advertisement in Australia and New Zealand Their song "Make Me Smile" was featured in a Victoria's Secret advertisement in the USA and an Orange advertisement in Romania in March 2010. Pearl and the Puppets Pearl and the Puppets was a band from Kirkintilloch, East Dunbartonshire in Scotland. The band comprised singer/songwriter Katie Sutherland (vocals/guitar), Blair McMillan (drums), Gordon Turner (guitar), Scott Clark (bass) and Michael Abubakar (keyboard). Sutherland's voice has been described as being similar to