My mother’s diamond ring (which was originally my grandmothers’ engagement ring and is 65 years old) has developed a crack. The ring is 1.1 carets and when last valued for insurance 3 years ago had no problems cited on the report. I’ve been overseas 5 months and just today over lunch noticed the crack which is about 2mm sort of running from the side and across the top.
Can anyone give me an idea how the crack may have originated? My (albeit VERY limited) understanding diamonds are the hardest rock on earth? Can something like this be repaired? How can we prevent the crack getting bigger?