Santa Maria Aquamarine Diamond Ring in Platinum.  Aquamarine stones are mined in locations all around the globe but some of the finest gem specimens are found in Brazil. In fact, it was in the Santa Maria de Itabira mine in Menas Gerais, Brazil, where the original aquamarine gemstone possessing a unique, deeply saturated blue hue was discovered. That is why aquamarine stones with such a color are now dubbed ‘Santa Maria,’ regardless of their origin. This beauty is flanked by glittering diamonds on each side. This platinum ring would make a striking engagement ring or a lovely right hand ring.