WOW! This is one of the very best examples I have seen from a famous pocket in the early 1980's of tourmalines in which the caps remained intact but the cores of the crystals etched away, leaving reverse cityscapes under the remaining termination. All, including this one, are floaters. Most are smallish (and in fact all I have owned before were thumbnails). In this case, however, we haave a large crystal with both terminations preserved, though a chunk of the middle has been "converted." The overall effect is striking and unique, and if you saw this in person you'd agree it to be well worth the price. Ex. Marty Zinn Collection