Q. Loose diamond
The diamond on my engagement ring continually comes loose. Each time I have it tightened it lasts about 3 months then it starts to loosen again. I have a 1.12 carat round stone in a 1 carat platinum setting. A jeweler suggested that my setting size may be too small and a larger setting, 1.25, may be in order. I do admit I am hard on my jewelry but this doesn't seem right. - Chesapeake

A. I would like to see the ring in question before forming an opinion. As to the size of the head, that is usually the goldsmith’s preference. I have worked with people who prefer to set in a larger and also a smaller heads. If the head is spread too far, it could be an explanation, but unless your diamond is very shallow and wide, I don't think this is the case. What is more important is the setting itself, and making sure the "notch" in the head fits the diamond. Some jewelers use a pre notched head, rather than cutting the prongs to fit your particular diamond. If this is the case, then that could also explain the problem. If you did in fact hit the diamond and unseat it, which is possible, then that would explain why it needs continual tightening. Finally, you might consider a six-prong head instead of a four-prong, even in platinum, as it would provide more security to your diamond. All the best, David Nygaard

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