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I was just listening to a show on diamonds on the radio. The guy said they are impossible to scatch since they are hard, but they are a brittle stone so they can chip, especially the pear or marquis shapes.
I have a 5 (round) diamond band and somehow managed to chip one.
So a cracked stone just looks dull... I wonder how many of mine are cracked and I'm just not observant enough to tell...
They definitely are not impossible to scratch. Other diamonds can scratch each other.
They do chip / crack, I feel, fairly easily. ALl it takes is a light whack in the right spot!