Our new collection of natural pearl .Pearls are made by marine oysters and fresh watermussels as a natural defence against an irritant such as a parasite entering their shell or damage to their fragile body, The oysters or mussels slowly secretes layers of aragonite and conchiolin, materials that also make up its shell. What's Akoya pearl meaning?The akoya pearl is a saltwater cultured pearl from the akoya oyster (Pinctada fucata martensii). Because akoya are the most abundant type of saltwater pearl with the longest cultured history, information on akoyas is abundant!, only located in Japan.