Ferruginous Quartz 16" Necklace. 14kt Gold filled chain & clasp. This beautiful necklace goes with any outfit, day or night. Wear it on its own or with other longer Necklaces for a more layered LOOK. Ferruginous Quartz, also known as: Hematoid Quartz contains both the amplification properties of Quartz with the balance and stability of Hematite. It's defined as a single Quartz point or cluster that contains a heavy concentration of Hematite and/or Limonite.