Vintage Siam Dark Blue Niello Enamel Sterling Silver Large Hoop Screw Back Earrings.
The measure 1 1/2" across the hoop centers, and 2 1/8" from the top of the stew back to the bottom edge. I only gave these a "quickie" polish to bring out the designs of the dancers more. Marked on the backs. They weigh 19.5 grams.