The larimar stone is an 8x10mm oval and the Sea Turtle pendant is solid .925 sterling silver. Each pendant is handmade. All larimar stones are unique so the one you purchase will vary from what is shown. We use only the highest quality larimar. Larimar is said to have a peaceful feeling of serenity to the wearer. The pendant measures about 1″ or 20mm from the top of bail to the bottom of foot. The bail will fit up to 3.5mm chain.