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Pi necklace | sterling silver
To most people pi is a number. In Russian it also looks like a letter, П, which is why this pi necklace in sterling silver went to a wife whose family name begins with it. It has also been a gift for a friend who teaches maths, and it suits any woman who lives happily among numbers.
Who It's For
- a friend who teaches maths
- your wife
- your mum
- yourself, to wear every day
Rebecca M.: “The necklace itself was good quality. My friend is a math teacher and appreciated the unique gift.”
Why Pi Never Ends
Pi is the ratio of a circle's circumference to its diameter, and it is the same for every circle, from a coin to a cartwheel. Its value starts 3.14159, and the digits never settle into a repeating pattern. In the 1760s Johann Heinrich Lambert proved that pi is irrational: no fraction of whole numbers equals it exactly. In 1882 Ferdinand von Lindemann, building on Charles Hermite's work on the number e, proved that pi is transcendental: it is not a root of any non-zero polynomial with whole-number coefficients. That settled a problem as old as Greek geometry. With only a compass and a straightedge, no one can draw a square with exactly the area of a given circle.
Explore Related Maths Jewelry
- pi necklace | gold vermeil
- phi necklace | silver
- integral necklace | silver
- golden ratio necklace | silver
FAQ
How big is the pendant, and how does it sit?
The pi pendant measures 14 mm (0.55 inches), about 4 mm smaller than a US dime, so it reads as a quiet everyday piece. It hangs upright from a small loop at the top and sits just below the collarbone on the 45 cm (17.7 inch) sterling silver chain with its 5 cm (2 inch) extender. Extra chains for layering can be added on this page: 40, 42, 45 or 50 cm with the extender, or 80 cm. Our sterling silver is nickel-free and hypoallergenic.
Is there a gold version?
Yes. The same pi necklace comes in gold vermeil, 2.5 microns of 18K gold over solid sterling silver, also 14 mm on a 45 cm chain with a 5 cm extender. Choose the finish the recipient already wears: the design is the same in both. For a second maths symbol, the integral necklace has a 32 mm pendant, in sterling silver and in gold vermeil.
Will it arrive in time, and what if it isn't right?
DHL Express delivers free in 1-5 business days worldwide, and we pay the import duties and taxes, so nothing is due at the door. It arrives in a ready-to-gift jewelry box and festive envelope. If it isn't right, our 30-day “Love It or Return It” policy applies.
Who first used the symbol π for pi?
William Jones, a Welsh mathematics teacher, in 1706. Born on a farm in Anglesey, he taught mathematics and navigation on board ships, then taught in the coffee houses of London. In his book for beginners, built on his teaching notes, he set π equal to 3.14159 and the digits that follow. Earlier, William Oughtred had used π in a fraction for a circle's circumference, but Jones was the first to use π with its present meaning. It became standard after Leonhard Euler adopted it in 1737.
Math & Physics
Unlock the elegance of the abstract with our math and physics-inspired jewelry collection. These carefully crafted pieces mirror the profound equations and natural laws that shape our understanding of the universe. Experience the allure of fractals, the rhythmic beauty of pi, and the celestial wonder of astral formations—each piece serves as a wearable homage to the artistry inherent in scientific inquiry.
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