Detailed Art Deco (1915-1925) Antique Cameo 2” White Gold or Sterling Brooch w/Diamond (?)

Detailed Stunning Art Deco Cameo Brooch. The cameo measures about 2 long by 1 5/8 with (50mm. by 40mm.) The woman wears a large diamond(?) not sure about Karats necklace. Roses in her hair. The cameo is set in a beautiful filigree frame (look like White Gold to me but can be Sterling - no marks), there is a loop so that it can be worn as a necklace. Total weight is 15.27 gr. . Real Art. Perfect condition.