These stud earrings feature twin translucent Montana agates hanging from bunches of silver bubbles.
Montana agate, sterling silver
Over the course of millennia, when water carrying silica minerals drips through cracks or holes in igneous rocks, it has a chance to build up and form agate. This type of microcrystalline quartz can form striking bands and patterns with a variety of colors, depending on the other minerals that find their way in. Agate is relatively common as stones go, but they are also one of the most interesting and colorful - no two are exactly alike!
Montana agates do, in fact, come from the state of Montana, around the Yellowstone River and its tributaries. They are characterized as having a very clear stone with red, brown, yellow or black inclusions that are appear mossy or plant-like.
Silver, oh silver. This lustrous white metal is amazing - more reflective than gold, more conductive than copper and just plain gorgeous. When used for jewelry, silver is mixed with copper or zinc to provide more durability and reduce tarnishing. Fine silver is 99.9% silver while sterling silver is 92.5%. Other alloys are used for specific processes, such as reticulation (80% silver). All silver will tarnish over time, but can be easily cleaned and polished.