Engagement Ring 18ct White Gold

I have a 18ct White gold engagement ring with a princess cut Diamond in a 4 claw clasp and with diamonds on the shoulders of the ring. The ring size is a M1/2 I purchased the ring from Purely Diamonds in london. I have all the paperwork and certificates for the ring also comes with a number of ring boxes I also have all emails from Purely Diamonds and the receipt of sale this a genuine ring. Any questions please ask. Open to sensible offers viewing is also available £700 ono