Anyone who knows if the Tiffany Elsie perreti open heart in medium and small can be purchased solely as pendants? Or is the chain really included? I see on the site that the chain is included already and there's no option of a pendant only. So anyone who knows if the open heart in silver can be bought only as a pendant? Also is the Elsa perreti 16 inch chain same as the other 16 inch chain used in their other necklaces? Thank you so much!