Material: Genuine Sterling Silver (925 silver, 92.5% silver content) Stone(s): Genuine sleeping beauty turquoise nugget, genuine druzy Overall Dimension (including bail): 3.2 x 1.2 x 0.25 inches Inner Bail Diameter: 6 mm Weight: 16.1 grams Stamp/Mark: 925 Serial Number: p27608 Gem quality druzy is created when a layer of tiny quartz crystals forms over the top of another stone. Natural druzy crystals can be colored themselves or take their color from the underlying stone. The surface of a druzy is sometimes coated with gold or other substances for a dramatic effect. Titanium druzy has been treated with a thin layer of titanium to give it a beautiful color and iridescent sheen. Beautiful turquoise is a phosphate mineral popular all over the world. Mined since 5000 BC, it is one of the first gemstones known to be used by humans. Color variation from sky-blue to medium green is affected by differing amounts of copper and iron, more copper giving the stone a bluer color and more iron a greener one. Beautiful light blue turquoise is mined in Northern Iran and other varieties occur in Mexico, the United States and elsewhere.