Women's Australian Lightening Ridge Natural Opal Ring (Vibrant colors of Orange, Blue, Green and Yellow), Size 7. Stone size 12x9x3MM, 2.6 Carats. The Opal was purchased separately and placed in beautiful setting by me. Top of the stone is flat. Beautiful traditional birth stone for October, symbolizing hope truth and pure thoughts. Beautiful addition to your jewelry collection. Contact me for any questions.