An short excerpt from the article:
Valerie from the suitably named King Jewelers found the perfect GoT engagement ring.
This is an “estate” piece that came in recently. Although I doubt it dates back to the middle ages it would be perfect for Daenerys Targaryen. And if she and Jon Snow were to marry I would strongly suggest the guest list not include anyone with the last name of Lannister, Frey or Bolton.