The over-80-year-old Brazilian jewelry houseâone of the countryâs most prominentâwas founded by the man who discovered Brazilâs first emerald mine. Cast in recycled 18k yellow gold and exquisite locally-sourced stones; the pieces here nod to the lushness and hues of the Amazon rainforest. For every piece sold; Sauer will plant trees in the Amazon in partnership with IDESAM.