Silver Necklace with Abalone Inserts

Stunning necklace with 6 crescent shapes and 3 tear drop shapes - each piece is 925 silver with abalone inserts - "SILVER 925" appears on the back of one of the crescents. It is faint, and I was not able to capture it in a photograph - the chain for this necklace is made up of 2 rigid silver curved pieces - the whole necklace is showing signs of tarnished silver, and needs to be cleane