Loose Diamond Definitions: N

Nacre-The iridescent substance secreted by a mollusk during the formation of a pearl that consists of layers of aragonite and calcite crystals.

Natural-A trade term for a portion of the original surface of a rough diamond that is usually left by the cutter on a fashioned stone, usually on the girdle.

Natural Pearl-A pearl that originates naturally in a mollusk, as distinguished from cultured or imitation pearls.

Needle - A long, thin included crystal that looks like a tiny rod.

Nick-A minor chip out of the surface of a fashioned diamond, usually caused by a light blow.

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