One that I see a lot is called porphyry

Inside a tiny thunder egg lies swirling colors that look like plant life suspended in water

Measures: Pendant alone measures 3/4″ long and hangs on a 18” chain

Arrives to you in a pretty paper box with a bow

25″ long and 1″ across

Mar Ring Color:Black One that I see aA lovely organic disc with a spot of gold. Handmade from sterling silver and 18k yellow gold with the option of plain silver or a dark patina finish. The central disc measures: 15 x 17mm. Original price: $150 Made to order in your size! List your ring size in the notes section at checkout, or just send me an email. :) This is a very organic ring. Expect there to small variations from the photos shown. Arrives to you in a gift box.