This bright medium toned yellow does not have copper in its composition.This medium light pastel standard round brilliant seems unaffected by its copper content. It is bright, flashy and eye clean. I posted it with a similar yellow without copper. It weighs 2.25 carats.
This bright medium toned yellow has copper in its composition (detected with spectrometer)
This medium light pastel has exactly the same color as #322 and yet my spectrometer picks up the copper absorption curve in this posted round and does not in the oval. The bright flashy round appears to be eye clean and of fine crystal. It is also not dichroic and a bit toned down for a yellow. It is too big for the droplets of color, but its heart lies there. It weighs 2.25 carats.
To show you the similarities between the two yellows, this one with copper and the other oval I mentioned above, without copper, I am going to post both of them. There might be some difference because of the different cuts, but they are dead ringers in color.