For example, red might dominate in the same portion of an opal cabochon where blue dominates when it’s viewed from a different angle. The most valuable opals display play-of-color from all angles.

A photonic crystal's highly ordered and repetitive structure affects the way light moves through it. Similar periodic arrangements are found in nature—for example, in precious opals and in the wings ...

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; ...

I don't think Serbia has the depth or quality to be able to match the Opals.' On the Boomers chances against Serbia, who have three-time NBA Most Valuable Player Nikola Jokić, Heal is less confident.

Sandra ‘Sandy’ Brondello proved herself one of the finest shooters in women’s basketball. Her offensive ability, especially from behind the three-point arc, and strong defence made her a valuable ...