Emerald is not my birthstone but it's the one I was always magically attracted to. Nearly craved!
One day I got an unexpected scientific explanation of it.
Emerald is a variety of beryl and contains chromium (which gives its green colour) and some other chemicals.
Some years ago I had a blood test which showed that I was deficient in chromium. Can you imagine? I was literally physically CRAVING for it!
The deficiency is gone, but you know what? I still want emeralds!
Have a nice day,
Olga