gems, topaz, rutilated topaz, treated topaz, heated topaz

Colorless faceted topaz containing acicular inclusions has been marketed as “rutilated” topaz, though earlier studies revealed that these inclusions are actually limonite-stained etched dislocation channels rather than rutile. This article discusses the application of heat treatment to convert the limonite staining into hematite, thereby enhancing the visibility and altering the color of the inclusions to make them appear more prominent.