JUNXIN .925 Women's Sterling Silver Filled Pendant Necklace.  22mm Starfish with bright blue fire opal.  This is on a snake chain, clasp is likely a lobster clasp, but very short, at about 15.75in, this is nearly a choker size. (nothing mentioned for any extender chain. )

Item Type: Necklaces
Fine or Fashion: Fashion
Pendant Size: 22mm
Necklace Type: Pendant Necklaces
Model Number: NL0126
Brand Name: JUNXIN
Style: Trendy
Chain Type: Snake Chain
Gender: Women
Shape\pattern: Animal
Material: Opal
Metals Type: 925 Sterling Silver Filled
Occasion: Anniversary/Engagement/Wedding/Party/Gift/Holiday
Necklace: Wedding/Engagement/Party/925 Sterling Silver Filled Opal Necklace