并非所有卖家都向消费者提供钻石分级实验室报告（又称钻石质量报告）。因此，我对您的一般建议是在与此类珠宝商打交道时将钱放在口袋里。 仅购买带有原始钻石质量报告的钻石订婚戒指。 实验室报告是对裸钻 4C 标准的独立评估，包括钻石净度特征的标绘图和钻石比例的图形表示。拥有这样的报告可以让您訂婚戒指 不同品质的钻石，并最终帮助您做出更明智的购买决定。 零售商可能会偷工减料而不提供实验室报告，或者不道德的卖家可能会提供假的，因为他将承担对宝石进行分级的时间、麻烦和费用。 是的 – 对钻石进行分级是有代价的（尽管该成本最终由消费者支付），加上将钻石送到实验室的运费和保险费。让我们不要忘记珠宝商在进行分级时几周内没有在他的商店出售钻石的机会成本。 但是，也可能无法获得钻石分级报告，因为获得一份报告的成本可能对戒指的最终价格影响太大。 例如，一枚价值 250 美元的 0.3 克拉钻石戒指，可能要花费大约 75 美元来进行分级，并在钻石的腰围上刻上证书编号。 当您为您的爱人寻找理想的钻石订婚戒指时，您会发现有一大堆实验室声称可以提供信誉良好的钻石分级报告。但我只会把我的钱放在… 顶级钻石分级实验室报告 是的，并非所有的钻石质量报告都是一样的。业内一致认为，两个主要实验室是 GIA-GTL（美国宝石学院宝石贸易实验室）和 AGS（美国宝石协会实验室）。 GCAL（Gem Certification and Assurance Lab）还提供 GCAL 所称的备受推崇的报告或“钻石证书”。 GIA 在独立性和一致性方面享有盛誉。由于其始终如一的颜色和净度严格准则，全球最大和最昂贵的钻石已被送往那里进行数十年的分级。2006 年，GIA-GTL 为圆形明亮式钻石添加了二维切工分级系统。 AGS 使用业内最严格的切割标准。它使用可以对多种钻石形状进行分级的 3D 光性能指标。事实上，它是唯一被科学界认可的切工分级系统。 更重要的是，它的钻石质量文件使用独特且专有的 0 到 10 分级系统来评估 4 C——该系统比 GIA 的分级系统更容易理解。事实上，AGS 甚至更进一步，将他们的 0-10 评级量表等同于其他形式的评级。 例如，传统的 VS1 钻石净度等级在 AGS 钻石质量文件中为 […]
Day: November 9, 2022
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