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海水珍珠(Akoya pearl)的AAA级定义 |
点击次数:596 发布时间:2007-9-25
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1 AAA Perfect Round; Excellent Luster; Thick Nacre (.7 of total nacre or better); 95% Inclusion Free Surface or Better; Excellent Matching; Top 1% of a Pearl Farm"s Harvest. 2 AA+ Perfect Round; Excellent Luster; Thick Nacre (.5 of total nacre or better); 90-95% Inclusion Free Surface; Excellent Matching; Top 5% of a Pearl Farm"s Harvest. 3 AA Very Round (less than 5% gradation); Good Luster, Good Nacre (.35 of total nacre or better); 80-90% Inclusion Free Surface; Good/Excellent Matching; Top 20% of a Pearl Farm"s Harvest. 4 A/A+ Round to Near-round; Moderate Luster; Medium/Thin Nacre (.2-.3 of total nacre or better); 70% Inclusion Free Surface; Good Matching. 5 A Round to Near-round; Moderate/Low Luster; Thin Nacre (less than .2 of total nacre); 60-70% Inclusion Free Surface; Good to Moderate Matching. 6-7 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.
1 AAA 圆度极高,极好的光泽,厚的珠层(0.7或以上的珠层含量),95%的表皮光洁度或更高,极好的匹配,珠农收成中最好的1%部份。 2 AA+ 圆度极高,极好的光泽,厚的珠层(0.5或以上的珠层含量),90-95%的表皮光洁度,极好的匹配,珠农收成中最好的5%部份。 3 AA 非常圆(少于5%的那部份的等级),良好的光泽,良好的珠层(0.35或以上的珠层含量),80%-90%的表皮光洁度,好/极好的匹配,珠农收成中最好的20%部份。 4 A/A+ 圆到接近圆的程度,中等光泽,中/簿的珠层(0.2-0.3或以上的珠层含量),70%的表皮光洁度,良好的匹配。 5 A 圆到接近圆的程度,中/低的光泽,簿的珠层(小于0.2的珠层含量),60%-70%的表皮光洁度,良好到中等的匹配。 6-7 经济级的质量,接近圆到不圆,中/低光泽,簿的珠层(小于0.2的珠层含量),中等到大量的瑕疵,良好到中等的匹配。 |
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