This piece was inspired by the golden ratio, aka phi, an irrational, non-terminating number (1.618...) that can be found in the Fibonacci sequence, nature, and art; it is sometimes called "the Most Beautiful Number in the Universe". Information: - made of solid stainless steel, which is hypoallergenic for most people - gold and rose gold pieces are vacuum plated over top of stainless steel - pendant measures 16mm x 22mm - necklace is adjustable between 17"-19" Also available as earrings! Packaging: - all items come with an information card in a lovely recyclable box, ready for gifting