Diamond missing from resized ring

On the 14th of February I came into your store with my girlfriend now fiance' to purchase a ring. She found the perfect one and we purchased it. On trying it on she realized it was too big and it was sent off to be re sized. She was super excited and all she could talk about all week was getting her ring back to show off to friends and family.Finally the day arrived on Saturday 20th February, she tried the ring on and it fit perfectly. But as she examined it closely she noticed something was amiss. One of the diamonds were missing on the ring! Your staff were very helpful and sympathetic especially a lady by the name of Lorraine, but none the less my fiance was extremely disappointed. Surely there should be quality checks in place when goods leave the workshop? This is unacceptable from a big brand such as Sterns. Now my fiance has to wait a whole week more and having to explain to people where her ring is. I am really disappointed in your quality check process and hope you re look at it in the hopes that this doesn't happen again to someone else.