Emeralds by definition should contain Cr and in the US some
containing Vanadium are also classified as emeralds.
If its green beryl, it ought to be emerald, regardless of WHY it's
green. It may not be very GOOD emerald (if the color is pale), but
green beryl is green beryl is only sometimes emerald, and only then
based on some arcane criteria that you need lab equipment to
Seems silly to me. But then, being the phillistine that I am, I
prefer a good synthetic anyway. They look better, being totally
without inclusions and flaws. LOL!
Ruby is just red corundum - except that there's apparently a move
underway (if not actually implemented yet) that wants to say it's
not enough for it to be red, it also has to have some specific
mineral in it. Otherwise it's "just" sapphire.
Again, seems pretty silly to me. If it's red, and its corundum,
it's a ruby.
Who know that a lot of historically famous "rubies" are actually red
spinel. Which if I recall correctly is actually rarer than ruby...