This has been long overdue. A very sweet reader emailed me sometime back to let me know about the real exact Caroline's ring that she bought from the Antique Jewelry Mall. They are the people who made the ring worn by Caroline in the Vampire Diaries. Here's the link to it http://www.antiquejewelrymall.com/ssr15la.html
The ring is much sturdier with the diamond drilled into the stone and slightly bigger too compared to the one on Etsy. If you're into vintage design jewelries like me, then you will love Antique Jewelry Mall.