Our blue topaz necklace is made in sterling silver with a natural pear cut sky blue topaz gemstone mined in Brazil. The stone is 12x8mm and adds a sparkling light blue color to your look in a classic pendant style. The stone sets into our sterling silver 4 prong setting with an open back and dangles from our cable chain that closes with a spring clasp. Perfect for gift giving for those that love natural gemstones. About Blue Topaz: Topaz belongs to the aluminum silicate group of minerals. Topaz grows into large crystals and the value is determined by its color, not the carat weight. Blue topaz comes in shades of sky blue, Swiss blue, and London blue topaz. Sky blue topaz has the lightest blue color, then Swiss, and London blue is the darkest. Materials: Sky blue topaz gemstone faceted pear cut 12x8mm 925 sterling silver cable chain and pendant setting If you have any questions just click "message seller" on our homepage. Thank you for visiting our jewelry shop, Linda and Joe .