I bought a diamond 3 weeks ago and last night I slightly banged it on the stove. I was just throwing something in the garbage and I turned around and it hit the stove, NOT EVEN VERY HARD!!!! Now there is a crack between two of the prongs. Was it set wrong or is the stone just a bad cut? It's hard for me to believe that such a slight bang would crack it. It is a round stone, 1.5 K and has six prongs. Any thoughts are greatly appreciated!!