The Czelline Opal Dome ring. Watch the hues and colours of Czelline Opal change as light flickers off its smooth surface. VTEOR20 Czelline Opal diameter: 19mm Band width: 4mm Material: Sterling silver, Czelline Opal Should your ring size fall outside of the size options on the product page, your ring can be made to order. Simply choose ‘Select other’ as your size and specify your required size in the box provided under 'Custom Ring Size'. Special size rings attract an additional charge. Please note that if an item is not currently in stock, delivery can take 4 to 6 weeks.