This cameo brooch was evaluated by Heritage Auctions Antique experts in Dallas, TX and they are the sole basis for my description. The origin of the production is unknown or manufacturer at this time. The assumed material is from visual inspection done at the time and I do not know the gold content. The size of this brooch is 1 1/2 in. long, 1/2 inch wide.  I am placing a value on this brooch based on sentimental value and other pieces by comparison.  I hope you will consider this lovely piece for your collection, as I have enjoyed it for years. I will ship free via USPS Domestic Ground Advantage Mail. Thank you for shopping with me, Gigi in TX.