This beautiful necklace is tested solid sterling silver. As pictured in the last pictures there is a gate on the back of the necklace that opens and so you can change out your stones as needed. The colors are blue pink green yellow and clear. The stones are gorgeous they really sparkle in the sun...this is such a clean pretty set! Such a great piece! If you have any questions let me know. Please check out my shop I have tons of beautiful tested jewelry. You can buy with confidence for me!