Commercial Quality Near-round to Off-round; Moderate/ Low Luster; Thin Nacre( less than.2 of total nacre); Moderate to Heavy Inclusions; Good to Moderate Matching.

• 7经济级的质量，接近圆到不圆，中/光泽，簿的珠层（于0.；2的珠层含量）中等到大量的瑕疵，良好到中等的匹配。