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August 2021

4C

The valuation of a gemstone is derived from the “4 C’s”: carat, color, clarity, and cut. Understanding all four of these is vital background to the buyer. Color Color is typically the most important value-setting factor for gemstones. All gems have a preferred color or a relatively small range of preferred colors. The more the…

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Sapphires

Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide (α-Al2O3) with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. It is typically blue, but natural "fancy" sapphires also occur in yellow, purple, orange, and green colors; "parti sapphires" show two or more colors. Red corundum…

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Gemstone Refractive Index

In gemology, refractive index is one of the chief means of identifying a gemstone. It is measured using an instrument known as a refractometer. The refractive index (often abbreviated RI) is an optical property that refers to the ratio of the speed of light in a vacuum to the speed of light through a transparent…

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