source des images

rubis:https://www.gemmantia.com/images/pages/rubis/rubis_purete_pur.jpg

diamant:https://www.bijouterielampron.com/wp-content/uploads/2014/05/diamant-plan-nord.jpg

saphir:https://www.lithotherapie.net/wp-content/uploads/2017/06/saphir.jpg