This is a diamond necklace made by TASAKI. The box and warranty card have been discarded. The engraving indicates platinum and 0.4 carat diamonds. I don't know the diamond grade because I don't have the card, but since it's from TASAKI, a well-known diamond brand, I think the grade is good. There are inclusions on the surface when viewed with a loupe. They are not visible to the naked eye. As it was something I used to love, there are small scratches overall from use. The color is E color. The cut is very beautiful. It's a gorgeous diamond that shines with a rainbow of colors, rather than a whitish sparkle. Please note that returns are not accepted to prevent switching. Thank you for your understanding. Final price reduction on September 18th.