Sterling Silver & black Jet stud earrings.
Jet is not a gemstone in a traditional sense but a mineral, but of organic origin as it once carried life, and is the product of fossilized wood. Much like coal, Jet was formed from the remains of wood that had been immersed in water for millions of years, after which it had been compacted and then fossilized.
These black Jet earring studs are made from Baltic Jet.