Gem News International Gems & Gemology, Spring 2014, Vol. 50, No. 1 Fine Australian Chrysoprase Rough and Carvings – Tucson 2014 Duncan Pay April 30, 2014 Figure 1. Mary Lou Osmond demonstrates the rich, vibrant color of Marlborough chrysoprase, which is due to high concentrations of nickel. Photo by Eric Welch. About the Author Duncan Pay is editor-in-chief of Gems & Gemology.