We found these excellent jewellery items being made by the lovely people at Yellow Owl Workshop, and we've picked out our favourite mathematical ones for you.
All items come packaged in a funky glass jar, and this elegant double-sided RGB/CMYK three-way Venn diagram overlapping colour pendant is great for showing your love for colour mixing, on screen or in print. The pendant comes on an 18k gold-dipped 20" chain (50.8 cm) with clasp, and the pendant is about .75" (2 cm) across.
Price = 1999 pence (the 303rd prime number) = £19.99