Rutilated Quartz Necklace with 14K Swirls1. 25"W x 1. 25"L x . 25" Rutilated quartz is a form of clear quartz that is characterized by the presence of needles or strands of rutile within the structure of the quartz crystal. Rutile is a titanium dioxide mineral, and sometimes contains large quantities of iron oxide. When the iron oxide content is high, the rutilated quartz may have needles of gold and red in it, and when the content is lower, it may have a darker, even almost black colour.