Colours and markings vary between crystals. You are purchasing the Shiva Lingam crystal, pictured.
About Shiva Lingham / Narmada Stone / Bana Lingam Crystals (Lingam)
Shiva Lingham (also known as Narmada Stone or Bana Lingams) is a sacred stone that comes from the Narmada River in India and is believed to be a crystal for enhancing fertility. This stone is also said to help overcome emotional pain brought about from early childhood.