The color the trade calls imperial topaz is highly prized and very rare. Many dealers insist that a stone must show a reddish pleochroic color to be called imperial topaz. The reddish pleochroic color ...

There is no official standard for Imperial topaz. Some dealers use the term for colors that are orange to pink to red to purple; others reserve the term for certain saturated shades. It’s the color, ...

The rare red Imperial Topaz, only found in Brazil ... As visitors explore "Topaz: A Spectrum in Stone," they are treated to a ...