Silver Plated Medium Pi - Filigree Heart Post Earrings. Silver Plated Medium Pi is approx. 0.59 x 0.47 x 0.08 (HxWxD) including loop. The irrational number Pi is a mathematical constant, the ratio of a circle's circumference to its diameter, approximately 3.14. It has been represented by the Greek letter since the mid-18th century. Silver plated Filigree Heart has a steel post. Earring post is approx. 15.4 x 8.25 x 2.2 mm (HxWxD) including loop. Earring backs are Bullet ''Clutch'' Style with Plastic Pad. PLEASE NOTE: Our products are not intended for individuals 14 years and younger.