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最好的珍珠是南洋珍珠和黑珍珠。珍珠:一种古老的有机宝石。主要产在珍珠贝类和珠母贝类软体动物体内;而由于内分泌作用而生成的含碳酸钙的矿物(文石)珠粒,是由大量微小的文石晶体集合而成的。根据地质学和考古学的研究证明,在两亿年前,地球上就已经有了珍珠。国际宝石界还将珍珠列为六月生辰的幸运石,结婚十三周年和三十周年的纪念石。具有瑰丽色彩和高雅气质的珍珠,象征着健康、纯洁、富有和幸福,自古以来为人们所喜爱。南洋珍珠:南洋珍珠是指产于南太平洋海域沿岸国家的天然或养殖的海水珍珠,其产珠贝主要为大珠母贝或马氏贝,主要出产国包括澳大利亚、印度、日本、印度尼西亚、菲律宾、缅甸、泰国等。黑珍珠:塔希提黑珍珠(Tahitian,又称大溪地黑珍珠)产于南太平洋法属波利尼希亚群岛的珊瑚环礁。珍珠母是一种会分泌黑色珍珠质的黑蝶贝。黑珍珠的美在于它浑然天色的黑色基调上具有各种缤纷的色彩,最被欣赏的是孔雀,浓紫,海蓝等彩虹色,她强烈的金属光泽随珍珠的转动而变幻,远非其它改色珍珠可比拟。一般黑珍珠的直径为8至16毫米。从圆形到梨形甚至环带状都有。塔希提黑珍珠给人一种生动的格调。这种珍珠传统上称为黑珍珠,但是他们的颜色系列由金属银色——铅笔铅的颜色组成。在这一系列颜色里,他们还伴有在光的折射下有不同颜色的泛光(overtones),如绿色、浓紫色或海蓝色。珍珠形态:1.圆珠指形态为圆形的珍珠,按圆度分为三种,即正圆珠、圆珠和近圆珠。正圆珠是指圆度最好的,商业上也俗称为走盘珠,最大直径和最小直径之差与平均直径之比小于百分之一;圆珠是指形态很圆的珍珠,其直径差的百分比在百分之一和百分之五之间;近圆珠是指形态上比较接近圆珠的珍珠,其直径差的百分比在百分之五和百分之十之间。2.椭圆珠指形态为椭圆形状的珍珠,长短直径比大于百分之十。可进一步按长短直径差百分比为短椭圆和长椭圆,短椭圆长短直径差的百分比为百分之十至百分之二十;长椭圆直径差的百分比大于百分之二十。3.扁形珠指形态为扁平面形,有一面或两面的近似平面状,如扁圆形、扁椭圆形、饼形、菱形、方形等。此类珍珠最适用于做珍珠串珠相连.4.玛比珠是一种半边珍珠,也称Mabe珠、馒头珠和半圆珠,也称玛贝珠。5.异性珠除圆珠、椭圆珠、玛比珠以外的其他形态各异的珍珠也为数不少,梨形、水滴形、米形、土豆形、豆形及其他形状的珍珠商业上统称为异型珍珠。评价标准:看光:所谓“珠光宝气”,光泽是珍珠的灵魂。无光、少光的珍珠就缺少了灵气。看光,应该将珍珠平放在洁白的软布上,能看到珍珠流溢出的温润的光泽;而迎着光线看,好的珍珠可以看到发出七彩的虹光,层次丰富变幻,还可以看到如金属质感的球面,甚至可以映照出人的瞳孔,特别明亮的可列入A级,稍次之为B级。光泽级别极强A反射光特别明亮、尖锐、均匀、表面像镜子,映像很清晰强B反射光明亮、锐利、均匀、映像很清晰中C反射光明亮,表面能见物体影像弱D反射光较弱,表面能照见物体,但影像较模糊圆度“一分圆一分钱”,“珠圆玉润”,珍珠越圆越美,这很符合中国人的审美习惯。大颗粒、精圆的珍珠,显现出如圆月的美感。配合光泽,则营造出朦胧的意境美。以珍珠最长直径和最短直径差的百分比≤1%为正圆标准,1%≤直径差比≤5%为圆的标准,在5%和10%之间的为近圆。不过大多时候,用自己的眼睛就可以看出圆度来了。(直径差百分比%)正圆A1≤1圆A2≤5近圆A3≤10椭圆B>10可以有水滴形、梨形扁平C具有对称性,有一面或两面成近乎平面状光洁度表面痘、斑、印、坑、点越少越好,一般在0.5米远外看不到瑕疵为可以接受的标准。A级的标准为100%表面光滑,肉眼近看看不出瑕疵。当然了,用放大镜都难看出瑕疵的那是万里挑一的极品中的极品无暇A肉眼观察表面光滑细腻,极难观察到表面有瑕疵微暇B表面有非常少的瑕疵,似针点状,肉眼较难观察到小暇C有较小的瑕疵,肉眼易观察到瑕疵D瑕疵明显,占表面积的四分之一以下重疵E瑕疵很明显,严重的占据表面积的四分之一以上所谓“七分为珠,八分为宝”,一般6毫米以下的珍珠不被列入珠宝级珍珠的范畴,7-9毫米为消费者所普遍喜爱,10毫米的珍珠已经难得,11毫米以上的则只有南洋珍珠和黑珍珠有了。越往上,数量就越稀少,而价格则往往成倍的增长。这个标准看的难度不大。颜色:淡水养殖珍珠的颜色分为下列五个系列,包括多种体色。a)白色系列:纯白色、奶白色、银白色、瓷白色等b)红色系列:粉红色、浅玫瑰色、浅紫红色等c)黄色系列:浅黄色、米黄色、金黄色、橙黄色等d)黑色系列:黑色、蓝黑色、灰黑色、褐黑色、紫黑色、棕黑色、铁灰色等e)其他:紫色、褐色、青色、蓝色、棕色、紫红色、绿黄色、浅蓝色、绿色、古铜色等。淡水养殖珍珠可能有伴色,如白色、粉红色、玫瑰色、银白色或绿色等伴色。淡水养殖珍珠表面可能有晕彩,晕彩划分为晕彩强、晕彩明显、有晕彩。颜色的描述:以体色描述为主,伴色和晕彩描述为辅。
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