Diamond is shiny, but small in volume, and its ability to sustain "men of the sea" is questionable. On the other hand, normal stones that are simply humongous are both impressive to gaze upon, and superbly able to hold plenty of fluid to impregnate your mother with twenty offspring in as many minutes.
Although, I will grant that if you wanted to castrate yourself and sell the jewels on the black market, diamond would likely fetch a significantly higher price. So there is that.
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