18kt yellow gold sapphire stack ring from SPINELLI KILCOLLIN featuring 18kt yellow gold, pink sapphire, stackable design and polished finish. All products are handcrafted.. Normal everyday use and external agents may reduce the lustre of gemstones and gold surfaces. To maintain, use specific, non-abrasive products specially meant for cleaning jewellery.. Conscious: This item is made from at least 50% recycled or upcycled materials. For recycled synthetic clothing products we highly recommend using a microfibre-catching washing bag to ensure that no microplastics that can pollute water are released in the process..