I have yet to see 27 Dresses but as I was trolling my favorite jewelry websites last night I found that Ice.com is retailing a wide selection of the jewelry worn in that movie.
I checked it out and there are some really nice pieces of jewelry for sale. I would imagine any one of these would make really nice Valentine's Day presents for that special person on your list.
My favorite was the gold over leather bangle bracelet with sterling silver and cultured pearl terminators. It totally reminded me of David Yurman's signature bracelet style. The bracelet is prices at $225 or 5 payments of $45 each.
They are also sponsoring a give-a-away to win the 1 carat diamond set in 14K white gold engagement ring shown in that movie. The ring has a value of $4,000. Plus, the runners up can win heart shaped lockets or pearl and diamond earrings. Check out the link in this paragraph for more details on how to enter and win. Good luck!