John Iversen, a jeweler and goldsmith, balks at being called an artist, but it’s impossible to look at the cuff-like bracelets, necklaces, earrings, and brooches he has made over the last 30 years and not see them as wearable sculptures. Apparently the curators of the Drawing Room agree, as they are showing his elegantly wrought jewelry and works on paper in the same gallery that has shown the artists Jennifer Bartlett, Robert Harms, and Costantino Nivola, among others.