Antieke juwelen glossarium
(verklarende woordenlijst)

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Emerald

A variety of beryl, and one of the rarest and most valuable of the Precious Stones. It is green, ranging from pale to dark, the most valuable being very dark 'velvety green'; the colour is derived from the presence of traces of chromium. Flawless stones are extremely rare, and most specimens contain inclusions, called the Jardin (garden) of the emerald. It is not affected by changes of light, as is a sapphire. Other, inferior, stones that are similar in appearance are green corundum, green tourmaline, demantoid. diopside. chrysolite, and hiddenite.