Dainty 4mm Cubic Zirconia Stud Earrings for Women Pink #E4289.

Lab-grown crystals with a refractive index of 2.15–2.18, nearly matching diamond's 2.42. Pink hue derived from metal oxide coatings applied during crystal formation, not inherent to the mineral itself. Butterfly clutch backing invented in 1960s jewelry manufacturing, still dominant despite alternatives existing. 4mm diameter roughly equivalent to a pencil eraser's visible face. Cubic zirconia first commercially produced in Soviet laboratories during 1970s optical research. Style code #E4289 follows alphanumeric systems allowing inventory tracking across global supply chains.Select