Tucked beneath the back of the stairs at the Ramada by Wyndham Tucson, 777 W. Cushing Street, Eritrean-born Huruy Zerzghi happily sells opals to anyone interested. But these are not just any opals; ...

Fire opal is an attractive variety of gem opal characterized by its red-orange-yellow bodycolor, with or without play-of-color. Since about 2013, the Chinese market has seen an increase in natural, ...