A very highly detailed pointed faceted sapphire necklace with a thin gold chain and gold setting, resting on a polished marble countertop, digital rational painting art by Lindsey Look, Mike Bierek, Kamila Szutenberg, David Auden Nash, Franz Vohwinkel, Volkan Baga, Sung Choi, Ryan Pancoast, highly detailed, digital concept art, professional product shot, studio lighting, from above, sharp focus, realistic concept art rendered in Octane Render