Tiffany has issued designs from their archive, dubbed Out of Retirement. using pieces from the 1940s to 2003. On the site, it isn’t indicated if these were all put into production or just archival designs.
This aptly dubbed rectangle ring looks kind of plain in the photo but worn, it’s a wow. It’s a rectangle that narrows toward the finger. Really a stunning piece, it is available in either gold or sterling. The sterling ring sells for USD$500. In gold, it is USD$4000.