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Greater amounts of colorless sapphire—promoted primarily as diamond substitutes, but also as natural gemstones—have been seen in the gem market during the past decade. In the absence of inclusions or ...

This selection of gems from Ouro Prêto, Brazil, and Russia's Ural Mountains, displays the golden orange to pinkish red color range of precious topaz. The gems range from 7.61 to 14.33 carats in size.

Nikon really has gone for glory with the design of this lens, which features a feast of high-end glass, including two aspherical elements, six ED (Extra-low Dispersion) elements, a fluorite element ...

To boost performance, the optical path includes three SLD (Special Low Dispersion) elements and four top-grade FLD (‘Fluorite’ Low Dispersion ... It is a fully-manual lens - but in my tests, I was ...