This is an authentic antique Victorian diamond and seed pearl starburst pendant, convertible to a brooch
The bail can be "folded" to be hidden, then this can be worn as a brooch or pin
The item measures 23mm in width (not counting the bail) and 4mm thick (not counting the pin in the back)

Gemstone: Natural seed pearls (not cultured, most pearls in vintage jewelry are completely natural and harvested from wild mollusks), diamond
Material: 14K gold

Note: The necklace chain is sold separately. You can purchase the solid 14K gold chain as an option, or use one of your existing chains for the pendant.