Need to up your gemstone IQ? There’s no better IG than GemologyGeek (@gemologygeek), Erica Silverglide’s colorful peek into “the world of Gems, Jewels & #Gemacation.” Don’t let the lengthy captions scare you; they’re packed with details about history, provenance, and even Mohs hardness. Breaking down all the diamond colors and their causes. (Trace elements of boron! Who knew?) Another treasured member of the GemologyGeek crew: Eloise the pup Showing us where star sapphires got their name Examining a 147.46 ct. (!) John Dyer Dreamscape-cut Bahia citrine Geeking out over a Muzo Emeralds–designed bracelet featuring the company’s stones Spessartine or spessartite? Both, says GemologyGeek, but spessartine is more common.