Can't remember the last time you studied isosceles triangles and rectangles? Neither can we. (Though we're pretty sure it was back when disco was all the rage.) Though it's been years since we set foot in a classroom, we were perfectly happy to educate ourselves on these beautiful new geometric jewelry collections.

London-born goldsmith (and Tom Ford protégée) Solange Azagury-Partridge has built her eponymous brand on opulent, gem-heavy pieces--including her own jaw-dropping, rough diamond engagement ring. Her most recent collection ($1,200 and up), dubbed "24:7" for its versatility, harkens back to Art 101 with spheres, cubes and stars. We love the organic yet abstract quality of the 18-karat-gold square earrings, star band white-gold ring and celestial pendant.

Inspired by the rough gems and minerals of the Northwest, Portland jeweler Teresa Robinson fashions exuberant geometric renderings under her label Stone & Honey. She brings a sense of schoolgirl chic to her latest collection of isosceles-shaped pieces, particularly this brass necklace ($64) and these dangling Metamorphic earrings ($98) and oxidized Triangle rings ($20), which are lovely when stacked.

Don't you look smart?

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