Many dealers insist that a stone must show a reddish pleochroic color to be called imperial topaz. The reddish pleochroic color often appears at the ends of fashioned gems—like pears and ovals—that ...

Other shades of topaz include yellow, orange, green ... "Over time, citrine became known as 'the merchant's stone,'" Harris ...

So it'll be yellow, orange, with the rarest being ... As visitors explore "Topaz: A Spectrum in Stone," they are treated to a ...