Offered for your consideration is a stellar Estate Jeff Cooper ring. It is platinum with eight accent Diamonds totaling @0.25 CT. The accent Diamonds are very good quality at 'G' VS1.
The center stone is a transitional cut Diamond of VS2 clarity and 'J-K' color. It is very sparkling as it does have an open culet. The overall impression is very elegant and would be an excellent choice as an engagement ring.
Since the stone is vintage, there would be less concern about its origins. And as a signed wedding jewel it would maintain and increase its value.
The ring is size 6.5 and weighs 5 grams. It could be sized by your local jeweler.