Thank you for viewing. I purchased this a few years ago and wore it a few times before storing it in my closet. The circumference is approximately 38 centimeters, measured by a layman. The head circumference is about 1.8 centimeters vertically and about 1.2 centimeters horizontally. I don't know if it's genuine. Would anyone who doesn't mind be interested? I don't remember it being very expensive. I checked it for the listing, and I think there are no noticeable scratches or stains, but I apologize if I missed anything. Please note that returns are not accepted, so please read the profile and ask any questions in the comments. An elegant necklace with a design of pearls and purple gemstones. MOGA MOGA LEQUIPE Wb - Material: Pearl - Design: With purple gemstones - Clasp: Lobster clasp - Crystal beads: Transparent beads used Thank you for viewing.