Carolyn Pollack Sterling Silver Blue Quartzite Doublet Earrings Genuine Quartzite, Crystal Quartz, Brass, and .925 Sterling Silver Measure approximately 2-1/4" long x 1/2" wide See Ruler View for accurate sizing. Silver may tarnish over time. Handcrafted in America with lifetime warranty on all jewelry Blue quartzite doublets with a dangle of openwork brass curlicues create a stunning look.