A stone's hardness is a big factor in what we use. Diamonds, moissanite, and sapphires are favorites, because they have a high hardness factor and can withstand everyday wear. Keeping our planet and human impact in mind, stones are hand picked from exclusive and vetted suppliers. Andronyk Studio has an internal classification system for stones. Origin or unknown origin of stones will always be disclosed for each piece on the product page for full transparency. For more information on material sourcing, click here.