If Take can get through the wiring while carrying everything, we might as well grab it. Also, grab the necklace first, in case we can only take one; we don't currently have an Accessory equipped so that should be the highest priority. As for Identifying it, it might be worth going back to Cerami (who will stay on this floor until we leave). She might only Identify stuff if we take a Boon (and Fetish) with it, in which case we'll wait until the next floor when we can ask Nagi.