Triangular black druzy set in tall 18k yellow gold bezel atop a 9mm wide half round, sterling silver band.  Very sparkly stone that catches all the light.
 
"Druzy refers to a thin layer of crystals that forms over the surface of a stone, often inside geodes. This one has been coated with titanium to give it that super-sparkly effect. Made with love, in my studio." - Linda Blumel
 
Currently a size 7.5, but can be sized up or down to fit you perfectly.