Topaz variety Imperial

A fine lustrous, gemmy single, well-terminated crystal of pinkish-orange prismatic Imperial Topaz from Ouro Preto, Brazil, measuring 3.5 cm tall.  The colour is fundamentally transparent pale apricot, but as soon as any other object comes close to it (e.g. fingers, desktop, cabinet) the colour intensifies to a much deeper champaign-apricot.  The crystal is perfectly terminated and has a good glassy lustre.  A splendid Brazilian Imperial Topaz which will display well.