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Often used to denote the Golden Ratio of (a+b)/a = a/b = φ, and reduced to (1+√5)/2 = 1.6180339887498... as is found in both art and nature.
Phi is also used as Euler's Totient function, φ(n) of a positive integer n is defined to be the number of positive integers less than or equal to n that are coprime to n.
There are many other uses of the lower case phi, such as the phi meson, probability theory, phi value analysis, dihedral angle, spherical coordinates, etc. A handy symbol!

We stamped this sterling silver pendant with the lower case Greek letter "phi" from our own die and little hydraulic press. The pendant is 5/8" diameter (15.87mm) and with the sterling silver bail is about 1" long (2.6cm).
It is stamped from 30 ga. sterling silver.
Thin, lightweight and elegant.

The pendant comes with a 32" black satin cord that can be tied to any length you desire.

If you'd prefer a cord or chain with a clasp check out the Cords and Chains section of our shop to see all our cords and chains with clasps options available for purchase:

This is the perfect match to our Sterling Silver Phi Earrings that can be seen in the Geeky/Science section of our shop.

All our jewelry comes wrapped in colorful tissue paper, in a nice gift box and tied with a bow ready for gift giving.
Nicholas and Felice

Phi Sterling Silver Pendant - Geek Math Necklace, Science Jewlery, Teacher, Scientist, Geometry


  • Handmade item
  • Materials: sterling silver, black satin cord, gift box with chenille yarn bow
  • Feedback: 10008 reviews
  • Ships worldwide from Oregon, United States