Marambaia topaz is some of the very best blue topaz available. These beautiful blue gemstones come exclusively from Brazil's Marambaia mine. Marambaia Topaz is a good choice for everyday jewelry because of its hardness (8 on the Mohs scale). This Marambaia topaz and moissanite ring is just lovely. The center rare topaz is a cushion-shaped stone that measures a nice 9mm x 7mm and it is a gorgeous shade of blue. It is flanked on either side by a row of sparkly, diamond-like moissanites. In fact, Moissanite has a 9.5 hardness on the Mohs scale, placing it just beneath diamond. It possesses fire 2.4 times greater than that of a diamond. This size 9 ring is made from solid sterling silver plated with platinum for strength and to hamper tarnish. It is stamped 925 and signed.