14kt rose gold ring set with oval faceted fine Imperial Precious Topaz & full cut round brilliant diamonds 28=.50ct. Imperial Topaz, with its distinct peach, pink, orange or champagne hues, is the rarest topaz variety. The primary source is the Ouro Preto mines of Minas Gerais, Brazil. Desposits were also found in the Urual Mountains in Russia. In fact Imperial Topaz was named in honor of the Russian monarchy who prized its luxurious golden-sherry hues. Today Imperial Topaz is classified as a very rare collector's gem.