Silver Tone Medium Pi Dream Affirmation Ring Necklace. Silver Tone 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 tone 2mm Belcher Chain Necklace is approx. 23 Inches with a Lobster Claw Clasp. Affirmation Ring is approx. 0.86 x 0.86 x 0.05 (HxWxD). This inspirational piece of jewelry is very meaningful. Its circular shape is symbolic for endless belief in the message that is imprinted around the ring. These are motivational or sentimental messages to the wearer. Makes a great team gift! PLEASE NOTE: Our products are lead safe, but are not intended for children 14 years and younger.