Details                                                                                         
Size of Pendant(cm) appx 2.1*2.5cm(0.83*0.98inches)
Size of Opal(cm) appx 1.8cm(0.71inches)   Diameter 
Length of Necklace(cm)appx 46cm(18 inches)  Included the Extending Chain
The Length of Extending Chain(cm) appx 6 cm(2.36inches)
Weight of Necklace(cm)appx 7.44grams