10k Yellow/White Gold Amethyst Heart Ring Sz 6.5

Great condition heart amethyst white and yellow gold ring, size 6.5. It was made by a jeweler in Grand Rapids MI. I have never seen another like it in the 20+ years I have owned it. The inside of the ring is stamped 10k with a letter in a diamond shape on one side that I cannot read. The other side of the ring has the number 19. The band measures 12mm wide across the front and goes all the way down to 3mm in the back. It also weighs 4.71 grams.