The production of gold jewellery involves various Gold alloys. At Maren Jewellery we have chosen to use only recycled 18 carat yellow gold to create high quality, long lasting jewellery for you. The gold in the Sphere ball ring and all other gold alloys we use are 75% pure recycled gold. Our recycled yellow gold is made up of 75% pure gold, 15% silver and 10% copper.