CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Rubies. Cut and polished ruby on top of an uncut ruby. Ruby is a red, transparent variety of the mineral corundum (aluminium oxide, Al.O3). Small amounts of chromium oxide (Cr.O3), substituting for aluminium oxide, give it its red colour. In addition to their importance as highly prized gemstones, rubies are used in industry as jeweled bearings in watches and scientific instruments. The finest rubies are found in Myanmar.
Model release not required. Property release not required.