This is the medium size (1” ) of this pendant with a 16” chain. This was an unwanted gift to me and has never been worn, so it still appears brand new in the box ready to be engraved and suitable for gifting. The inner and outer boxes are in pristine condition. I will enclose the white satin ribbon as well, it was untied so will need to be ironed and retied. I did not make this purchase but I see no red flags to suggest it is anything but genuine. I did dip the chain in sterling cleaner to shine it up to sell and it is clearly sterling and the tags and engravings look like my 3 other Tiffany pieces that have spring clasps but if buyer has any reason to doubt authenticity I would accept a return. It is a pretty necklace and would make a great gift for the right person, maybe you?!