Platinum and white gold diamond ring set

These rings were purchased in 2018 for $6000 ($5000 for the engagement ring and $1000 for the wedding band). I do not have the paperwork nor do I know the specifics. POSHMARK WILL AUTHENTICATE THIS SET. The center stone is a little over half a carat in size and the metal was platinum for the engagement ring and white gold for the wedding band. They are size 6.5 They have been soldered together but could be taken apart and/or resized by a jeweler. No loose stones, all in good shape. Open to reasonable offers