18K recycled yellow gold Conflict-free sustainable white diamonds Color D-F / VVS -VS1 8 round diamonds :0.41ct 7 Natural Ethiopian opal heart stones : 4.5 ct Necklace length 15"+ 2" extension chain Handmade in Italy CARE INSTRUCTIONS Opal stones : avoid prolonged contact with water, exposure to extreme temperatures and chemicals. Clean them gently with a soft, damp cloth to maintain their natural beauty. Explore our Jewelry Care Guide for further information Diamonds with a GIA report are available over 0.25ct upon request. Please inquire for associated costs.