Lemon Yellow Citrine Sterling Silver Necklace

This is an 18" necklace. The snake chain is a great quality. It doesn't kink, has a nice flowing movement. It is marked, but I am unfamiliar with the maker. It's marked 925, Italy, and what looks to be CN, with the CN overlapping. The stone is a bright lemon yellow citrine. 1.5 ct. The setting is also marked with the same on the interior of bail. This was purchased new with no packaging. I do have bags and boxes if you need one. Just let me know.