A bizarre specimen! The piece consists of an original crystal of topaz that was replaced by danburite (as confirmed by XRD analysis at Cal Tech), followed by a SECOND deposition of topaz, that then over-coated the old topaz crystal now replaced by danburite. Thus the phantom within is actually not topaz any longer despite first glance thoughts. I should say this was mined pre-embargo and has long been in the noted Mogok suite of gem and mineral dealer Bill Larson, who more or less opened up this region for minerals in the last decades. Recently exchanged to me.