Summary: There are isotropic stones and anisotropic stones. If you shine a laser through isotropic stones, you get black and white, but if you shine a laser through anisotropic stones, you get beautiful colors. According to ____ 21:19, the 12 stones of Jerusalem are only anisotropic, and they could not have known that because they didn't have lasers back then.
But aren't diamonds pretty dull until they get refined, anyway? I'm just thinking that there probably is some other factor that caused people 2000 years ago not to consider diamonds, spinel, pyrope, and almandine.
Just for reference, the 12 stones of the New Jerusalem: Jasper (Quartz), Saphire, Chalcedony, Emerald, Sardonyx, Sardius (Carnellian), Chrysolyte (Peridot), Beryl (Aquamarine), Topaz, Chrysoprasus, Jacinth, and Amesthyst.
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