The Great Frog has been a metal-tinged jeweler in London since 1972 and is still going strong, notably with the above Powerslave-era Iron Maiden ring! The ring is currently for sale on the jeweler's website for £240 ($362 American), which might sound steep but I can't imagine this ring is anything less than amazing quality.
Here's what The Great Frog's site has to say about the ring.
Cast in British .925 sterling silver each ring is individually numbered and comes with a Certificate of Authenticity and signed letter from TGF owner and designer Reino Lehtonen-Riley.
It's worth noting that Iron Maiden actually worked with this jeweler in 1984 and 1985 on a Powerslave belt buckle on the Powerslave world tour, so I'd assume whoever runs the jeweler was and still is a fan! Here's a video of the making of the ring:
