Tri includes a pair of Sparkly White, Maroon, & Dark Blue Druzy earrings  

Light weight and made of a resin cabochon. Rose gold or silver setting option is a plated copper earring setting. No setting option is silver plated alloy metal earring post. ALL options are lead and nickel free. 
Earrings come with rubber earring backs for comfortable all day use.
12 mm is the measurement of the diameter of the druzy or "width".