Explanatory notes
… shaded or coloured (e.g., grey, black, purple, red, yellow, green or blue). They are usually round, but sometimes half … the same composition, but usually takes the form of thin sheets. This heading also includes cultured pearls (i.e., … to remove defective parts, drilled or sawn (e.g., half or three-quarter pearls).The pearls of this heading may be …