推荐回答（2个）
首饰掉钻一般是不常见的，品牌首饰质检过程比较严谨，这种情况会更少，但不是说就没有，毕竟因为材料软硬度、镶嵌方式、质量检验总会有错漏的时候，所以饰品掉钻不能完全避免。同时，在佩戴过程中，如果不注意保养，也会导致钻石松脱，如镶爪被衣服纤维拉扯、或受到其他外力的挤压、变形等都会对钻石的镶嵌牢固度有不利的影响。
楼主所述的情况就比较难以认定责任，毕竟时间过长，所以这种情况绝大多数商家不会给予赔偿钻石，除非你有很有力的证据。多数商家会帮你修复和重新配石，但是石头的钱可能需要自己付，特别是大克拉的石头!
据有关人士介绍，裸钻质量相差1分，价格会上下几百甚至上千元。购买钻戒，消费者绝对处于弱势，由于裸钻从钻戒上敲下，戒托就将作废，珠宝质保站在对钻戒做检测时只能测总质量，消费者自己也不好拆下裸钻去检测质量。所以，裸钻究竟有多重，就只能看厂家的信誉了。
以上是一点关于钻石和托之间的关系,对于购买钻戒的消费者是一群弱体,有很多的条款具有两面性(霸王条款的意思)
有一个例子(本人指的是主人公):本人日前在万达广场的正生生珠宝看中个彩金钻戒,因为指环太大有点犹豫不决,当时店员很热情得介绍说只要喜欢他们可以改小指环的.于是决定买了戒指并要求缩小指环,因为每个钻戒都附有质保书,我再三询问改小指环是否影响质量及重量在得到确定保证后才放心离去.第三天我去取改了指环的戒指,临走是还是不放心问了重量不会错的吧,得到的答复是应该不会错,正好看见收银台旁有天平就随手一称,呀!竟然少了0.16克.一下子我有受骗的感觉.而且让我哭笑不得的是店长居然说你买的是钻戒,彩金不值钱,最主要是钻石的价值.而且改指环会少重量是常识,所有人都知道.我是在无理取闹.请问我该怎么做?无奈之下我选择了投诉消协,可是该店负责人还在消协大放厥词,我我赔钱是不可能的,最多把那少掉的金子给你好了,我是电视台做的,有本事你去打官司好了.难道我就没地方讲理了? .....
又比如:新华网江苏频道南京1月26日电:同一款同一克数的钻戒,一颗少了0．5分（1分等于0．01克拉），另一颗却多出了1分。昨日，南京市质监局在太平南路某珠宝行抽检的两颗裸钻的分量都不准，令人震惊。
检查人员在太平南路某珠宝行，随机抽出两颗钻戒进行检测，总质量都没有偏差，裸钻质量却上下惊人。一颗售价7930元的铂金钻戒，标签上标明的裸钻质量是24分，计量部门当场校验后发现只有23．5分。而另一颗售价8780元的28分铂金钻戒，经校验，裸钻质量竟有29分。检查人员估计，这可能是由于钻戒制造商对电子天平的保养和使用不当引起的。电子天平是能精确到万分之一克的精密器具，保养和使用非常讲究.
从检查情况看来，没有证据表明是厂家恶意欺骗消费者，但是暴露出来的裸钻质量不准问题却需引起有关方面的注意.
从以上有关调查显现出钻戒这一行业的一些问题---本身您和商家发生交易时,商家就有可能隐藏着很多"不可告人的目的"所以说"卖家不管"肯定有很多很多他们认为非常合理的"理由"来说服消费者.如果您想淘个说法的话,选择好您投诉他的切入点(比较充分的维权理由),我感觉以掉钻了这个理由找商家索赔,这个方案好象行不同.具体怎么维权可以求助律师或者朋友对您有很大的帮助.我说这么多您是否能够明白,祝您生活愉快,事事顺利!
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