Here's a recent diamond we got from a customer in a trade. They bought the 0.75ct princess shape diamond and it was mounted in 4 post prong mounting not really designed for princess shape diamonds. When the ring was knocked really hard she lost 1 prong and it took a chunch of her diamond out at the corner as well.
Diamonds in general are very hard and can take a lot of compressive loads, just like, say, concrete. But they are still brittle like concrete and so if you take a hammer and chizel to them they will chip if struck at the right angle with the right amount of force.
This diamond is now 0.69cts and after it's re-cut into a radiant shape it will only yield about 0.55ct size. So be sure to get a v-prong mounting for your princess shape diamond, or semi-bezel or full bezel or just make sure it's well protected against chipping!
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