Jack Spade Pi Keychain

Jack Spade is the male counterpart to the heavily female-centric line from designer Kate Spade. The Pi Keychain could certainly appeal to anyone, regardless of gender. The ring and the key on it, which is un-filed, are both made of sterling silver and the ring is engraved with the first twenty-one digits of the number pi: 3.14159265358979323846. It is a subtly flashy keychain, perfect for those who don't like to have unnecessarily large things dangling with they keys. Price: $90.