I don't know how to grade a diamond, but this stone has sparkle and is quite clear. I took it to a local jeweler, they said it was vintage, the center diamond was a European cut around 1/4 carat, but it was difficult to say since it's in the setting. There are 18 smaller stones pave' set around the center stone. All test as diamonds. That was all the information I could get without paying for an appraisal. It is set in 14K white gold and both the piece that twists onto the stem and the piece that holds the diamonds test as 14K. The only other mark besides the 14K is SHOE, as seen in the picture.