Vintage Abalone Shell Ballerina Brooch

Brooch is in excellent used condition, with minor surface scratches due to age. I am of the strong belief that the accent material used is Abalone shell but I have no way to confirm. Brooch is gold toned Ballerina shape adorned with multiple circular accents forming the dancers skirt. Pin back is sharp and ready to wear. No manufactures marking See photos for measurements I don't know much else about this brooch as I'm selling it on behalf of another party. I'm also not able to be extremely flexible on offers as I am selling this on behalf of someone else. Questions? Please ask prior to purchase.