HERMIONE’S EARRINGS, STARFLEET CUFF LINKS and “THE DARK KNIGHT” MONEY CLIP : If you’re looking for a sly, understated gift for “Harry Potter” fans (you know, something that doesn’t scream “Muggle!”) consider these graceful earrings of sterling silver and pink crystals ($59) fashioned as an homage to the ones worn by actress Emma Watson on screen. You can find them at the Warner Brothers shop along with a staggering array of wizard merch. In the same low-key vein, for fanboys who don’t want to loudly broadcast their obsessions, there are some nifty Starfleet cuff links ($65) that are crafted from enamel and plated silver and have a bullet back closure; you can find them (as well as a Klingon counterpart product) at Cufflinks.com. We also like the folding, magnetic Batarang money clip ($39) from the Noble Collection that would fit the sleek sensibilities of Bruce Wayne but might be too small for the wad of spending cash he keeps in his utility belt.