Where Ellagem, a New York-based jewelry company internationally known for its outstanding designs, is finding the world is its oyster these days. It was recently announced that the company will have a piece, pictured [here], featured in the American Museum of Natural History's "Pearls" exhibition, scheduled to open Oct. 13. Ellagem is in itself a New York gem, housed in a private salon with the atmosphere of a luxurious home filled with fine art. You can get a jump on the museum exhibition by shopping here for similar fabulous precious-stone pieces, by appointment only, personally attended by Ella Gafter, the company's brilliant design force, and her daughter Talila, who is its manager.