Black Onyx Earrings Unique_Gifts Terahertz is a manmade stone

Terahertz is a manmade stone that is produced by extracting silica from sand or quartz

The rectangular stone has multifaceted cuts on it

ranging from light sky blue to a deep green/teal

which is a beautiful and unique gemstone that forms from the fossilized shells of ammonites

They measure approximately 3-4mm in size

Black Onyx Earrings Unique_Gifts Terahertz is a manmade stoneSimple and sleek geometric earrings made with triangle shaped black onyx stones and sterling silver. There is a small silver terahertz bead accent on each end, and they are a lever back closure that stays securely on your ears. Stamped 925 sterling silver. Total length of these earrings is approximately 3. 5 cm; lightweight and comfortable for wearing everyday. Ships out in 1 business day via USPS.