Long Necklace. Main Stone: Simulated Pearl & Cubic Zirconia. Material: 18K Rose Gold Plated. 925 STERLING SILVER JEWELLERY. Chain Length: 38cm With 6cm Extension. You can help stop this by following the care instructions here: Under normal use our jewellery will not tarnish for quite a while but this depends on how it is looked after, where and when you wear it, if you wear skin creams or lotions and how often you wear the item.