The etymology of the word diamond is interesting, also giving us Wolverine’s adamantium. However, I’m tying to understand how the playing card suit came to have the name. The modern deck of cards is based on French designs but the suit we call diamonds was called tiles in French. I haven’t been able to find anything about how the suit came to be called diamonds in English.
The suits as we know them come from about the early 16th century and gemstone diamonds from that era were mostly “rose” cut which is basically a six sided pyramid with a flat bottom - kind of like a triangle, I suppose, but it seems a stretch to try to link the shape of the symbol to the actual gemstones of the time. Help?