Oval shapes with triangular and kite-shaped facets on the gem's crown (top portion) and parallel rectangular facets on the gem's pavilion (bottom portion) are very common for corundum of all colors. Photo: Robert Weldon/GIA. Courtesy: Lewis Allen
Madagascar is a relative newcomer as a major sapphire source, but its stones can have an intense blue color that rivals the finest from more traditional sources. - Copyright: GIA & Tino Hammid
This sapphire from Kashmir has an intense velvety blue color. – Photo: Robert Weldon/GIA.
Most people who think of sapphire picture the color blue. - Courtesy Bulgari
Deep, intense, velvety blue is the best way to describe the color of this sapphire from the Kashmir region on the India/Pakistan border. - Courtesy Edward Boehm, JOEB Enterprises, Chattanooga, Tennessee
Figure 4. Rainbow over Montana bracelet. Yellow gold and sapphires from Montana. Photo courtesy of Paula Crevoshay.
Figure 2. Paula Crevoshay’s “Yogo Columbine” pendant displays the remarkably consistent blue color of Yogo sapphires: 243 in all, with a total weight of 13.89 carats. The piece also contains 0.59 ct of yellow sapphires and 1.37 ct of diamonds, set in 18K yellow and white gold. Photo by Orasa Weldon.
Figure 3. A typical polished Yogo wafer sample measuring 0.93 mm thick. The c-axis is perpendicular to the wafer surface. Note the distinct color uniformity and the lack of any color zoning. Ten LA-ICP-QMS measurement points can also be seen on this wafer. Photo by John L. Emmett.
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