Additionally, the phenomenon of opal whitening, particularly in Ethiopian fire opals, was investigated. Researchers proposed that the unique zoned opals found in Ethiopia are a result of ...

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; ...