There are some exquisite antique and new magnifying glasses out there, but they tend to be quite pricey. I think Anthropologie's Oceania magnifying glass, $18, would make such a cute gift. Depending on the recipient, either on its own or combined with a new fall release such as Hamish Bowles' book, Vogue Living: Houses, Gardens, People.
Or, for a rare friend, a first edition of David Hicks on Decoration with Fabrics, available through Paris Hotel Boutique.
B.D. Jeffries sells resin tortoise-handled magnifying glasses. $130.
If you look closely you can see a beautiful bamboo-handled magnifying glass on this Domino editor's coffee table. Photo by Jennifer Schlechter, May 2006.