Vintage massive gold tone necklace w Aurora Borealis and sparkly rhinestones

Vintage gold tone necklace. The pendant is large and sparkly, with filigree detailing and various blue, green and pink rhinestones. Also with Aurora Borealis stones around the central sapphire blue stone. This used to be a brooch, but part of the closure broke, and the remaining pin was converted into a round bail, as pictured. In excellent condition, with very minimal wear. 30" chain. 2.25" pendant.