Neal, this necklace is a similar style to the 1910 Tiffany Necklace you can see on this page. However, the metal in this necklace is platinum and embellished, with blue sapphires. This Tiffany necklace currently resides in the Metropolitan Museum of Art, in New York.
Costume jewelry designers imitated the great American and French jewelry designers.
The cameos in your necklace and matching bracelet set are not antique cameos. You can see this from the subject. The material from which the cameos are made appears to be mother-of-pearl shell. Thank you for your contribution.
