18分PT950钻戒的色度D-E 与H之间的价格差别有多大？净度: VVS 与VS价格差别多大？
推荐回答（3个）
30分以下的钻石不具备保值及升值功能，所以这个性价比低。18颜色和净度的差额不会超过1千，因为30分以下的钻石有的没有证书，有也是国检的。
如果你买的是牌子建议你买裸钻，品牌附加值会很好，不是钻石本身的价值。
你可以选GIA证书，30分裸钻，净度VS2，颜色H，切工3EX的就可以，这样综合性价比比较高。加上戒托应该在5千左右。应该不会比你选品牌的18分成品钻戒贵。
还有如果戒托用爪镶或者包镶的可以用PT950的，如果是特殊款式建议用18K金，会比较结实。
希望你买到满意的钻戒，有不明白的可以追问。
其实D-E 与H之间不作对比的话，外行也看不出来。VVS 与VS更是肉眼看不出来的，要放十倍放大镜才看得出来。我的建议是，女人嘛，当然愿意戴大颗一点的，18分还是小了一点，买个25分左右的吧，疼就疼一次，免得以后嫌它小。色度在H色其实可以了了，火彩好（切工决定）的就更闪了，净度不用多大要求，毕竟没有谁会拿着放大镜看你的戒指。而且你买是作饰品，不是用来保值的。 18分，H色，VS，AU750戒托大概在3000-4000；25分，H色，VS，AU750戒托6000左右，我曾经看到25分，H色，VS，铂金950戒托折后6000多，建议过节的时候在商场看看，折扣大些。
4C 分为 颜色净度切工大小
颜色 D E F G H I J K L M N.....Z （颜色D是最好的 依次往下排 其中D-H是白色 IJ是浅黄白 K以下是黄色 我们一般选择H以上就可以 F-H在白炽灯底下是看不出来的 在肉眼看的话 I色以上是看不出来颜色 所以 我们买性价比高的话 颜色选择H色）
净度 IF VVS1 VVS2 VS1 VS2 SI1 SI2 SI3 P1...P3 （净度IF是完美无瑕 依次排序 其中 VVS级别的显微镜30倍有一点点的瑕疵 VS级别的30倍放大镜有点瑕疵 SI级别10倍放大镜有一点区别 如果肉眼看的话SI1以上的裸石 肉眼看不见瑕疵 所以我们选择性价比最好的是SI1）
大小 0.30 .....（GIA证书的裸石从0.30才会有证书）
证书 GIA NGTC ..（其中GIA证书的裸石在裸石腰号上会有自己的编码 所以不会被人掉包 NGTC就没有 而且价格会比GIA的便宜 但是最值钱的是GIA证书裸石）
如果30分 H SI1 EX N（无荧光） GIA证书 无咖无奶油色的裸石 价格是3055元
钻赏珠宝的价格
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