What an interesting setting and shape! I am seriously loving this! One of my favorites!!! Looks like an emerald cut sideways. Would rather have white or yellow gold. Or Diamond or Sapphire. maybe no diamonds around the main gem?
Art Deco Full Eternity Diamonds Wedding Band Engagement Ring Anniversary ring Antique Diamond Ring Jewelry Band in 14K Rose Gold by InOurStar on Etsy https://www.etsy.com/listing/207598271/art-deco-full-eternity-diamonds-wedding