This standard round brilliant is a great gemstone. It is eye clean and has a medium light pastel yellow that is reasonably stable in any white light. No greenish yellow here, but it can not compare with the sharp saturated yellow gems like #629. So this is a nice, bright, flashy, medium toned yellow, but what makes it great. It has copper in it and that makes it unique in the collection. Now I have no way of knowing if copper actually influences the color of the round, but just the idea that my spectrometer found the copper in a gemstones is nice. (The GIA’s article on paraiba type tourmaline from Mozambique includes a yellow.) It weighs 2.67 interesting carats.