This exceptional antique ring dates from between the late Edwardian to early Art Deco period, as there are elements of both. The 10K white gold setting shows intricate engraving, most of which is decorated with blue, green, and black enamel. The enamel work with the pale yellow-green stone is a stunning combination. The bezel-set, emerald-cut stone is a spinel. The highly-reflective synthetic stone glows under UV or black light, as uranium or vaseline glass would. But this genuine gemstone is spinel, and although it was man-made in the lab, it phosphoresces like any natural phosphorescent mineral. The inside shank is embossed “10K” inside a rectangle. Appears to have never been sized. Please keep in mind that the photos show the ring highly magnified and any flaws seen are not visible to the naked eye. Approximate measurements: 15.2 mm–face of ring North to South, 3.6 mm–back of shank. Approximate weight: 6.67 grams. Note: The color of the spinel is not as green as photos show. It is more pale with more yellow, especially in indoor light, close to the color of real Vaseline. Photos and video were taken in sunlight. If you need the item by a certain date, please be sure to let me know. Please note: I have NO control over the U. I DESCRIBE ALL ITEMS TO THE BEST OF MY ABILITY. Vintage and antique items are NOT new, so do not expect them to be perfect. They are rarely in mint condition, so do not expect them to be mint unless specifically stated. Thank you for viewing my listing.