In nature, pearl oysters produce pearls by covering a minute invasive object with nacre. The combination of aragonite and conchiolin is called nacre, which makes up mother-of-pearl. Bone, abalone shell, nacre, and tooth enamel are all nanocomposites. The mineral found in nacre is aragonite, CaCO3, and it occupies 95% vol. All nacre pearls may one day be limited to natural found pearls. In bivalves, the nacre layer is formed of single crystals in a hexagonal close packing. The shells exhibit a light purple nacre on the inside. This produces the hexagonal close-packing characteristic of nacre. In 2012, researchers created calcium-based nacre in the laboratory by mimicking its natural growth process. The natural nacre may be artificially tinted to almost any color. Some of the current techniques are described here for nacre imitation. Nanostructured artificial nacre is another option for creating artificial bone. Typical examples of such materials are bone, or nacre. Hejaz's primary exports were dates, henna, hides, Meccan balsam, gum, nacre and Zamzam water. The form of nacre varies from group to group.