METAL: 18k Gold. MEASUREMENTS: Necklace's wearable length is 17 3/4" , center section (pendant) is 43mm long. GEMSTONES: Diamonds approx. 3.00ctw, Opal - 32mm 19mm x 7mm, Baroque Pearls . MARKED: 750, Liechti. WEIGHT: 123.8 grams.Gemstones have not been graded for color and clarity ,and tested for clarity and color enhancement, unless stated otherwise.