There are many kinds of rare gems in the world. Did you ever wonder how they got their names? Let's find out.
The word diamond comes from Old French diamant, from Vulgar Latin adiamantem, dia- "through, throughout"+ adamantem"the hardest metal."
Ruby is also from Old French, from the word rubi. It in turn comes from Medieval Latin rubinus lapis, "red stone."
Sapphire, from Old French saphir, is derived from Greek sappheiros, "blue stone." Okay, not that imaginative, but does the job.
Emerald, you'll be shocked and surprised to hear, comes from Old French esmeraude (where else?). That comes from Latin smaragdus, from Greek smaragdos "green gem." That's where we get the Finnish word for emerald, smaragdi, by the way.
Okay kids, what did we learn today? The French have the best (words for) gemstones, and the fancy-sounding names are actually anything but. "Green stone." Point. Grunt. That's all you need for trade, really.