Hello dear Sir,We introduce you our company history, we are based in Antananarivo, Madagascar to six generations. Here our main business is to manufacture Gold 750/mill (18K) and silver 925/mill jeweler with precious and semi-precious stones, the all kind of stones in Madagascar, we have a big chance is 100% natural.And thus on the quality of our stones you had nothing to fear and all our stones are 100% natural without chemical treatment.We can provide you all kind of stones you like.