Anne Bishop is the author of the following books:
The Invisible Ring (same universe as Black Jewels)
The Black Jewels series is sometimes referred to as the Dark Jewels series. Bishop is writing a new trilogy which appears to be in a different universe, but still dark fantasy. There had been some speculation among her fans that it would fill in the background of the Dark Jewels universe, completing all of the references in the series to "fifty thousand years before." Looks like no such luck for now, as of June 2001.