I finally changed my Emerald cut diamond, for a brilliant (please see previous posts). I love it!!! I can’t believe I did not get the brilliant from day one. I have been wearing it for a week now, and yesterday was the first day where the sun was shining brightly. My diamond is amazing ideal cut, but yesterday in the direct sunlight, the diamond darkened, although it sparkled more than ever. I have read in previous posts that this is normal, but I am still a little worried, especially after the shadow problem I had with my last diamond. Why does a diamond go dark in the sunlight?