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The five cardinal gems. Clockwise from top: sapphire, ruby, emerald, amethyst, diamond. Cardinal gems are gemstones which have traditionally been considered precious above all others. The classification of the cardinal gems dates back to antiquity, and was largely determined by ceremonial or religious use as well as rarity. [1]
The earliest known emerald is a single unengraved stone mounted in a gold ring, dated circa 330–300 BC. A 3rd century BC date is far too late for emeralds to appear in Exodus and Ezekiel. [ 5 ] However, the Greek and Latin terms smaragdos , smaragdus are broad enough to include other green gemstones, the most valuable of which was the emerald.
Heat can either improve or spoil gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in "ametrine" – a stone partly amethyst and partly citrine.
The Warner ring has a rose pear-shaped diamond in a black-enamelled setting. The ring was also said to be one which Elizabeth gave to the Earl of Essex and he returned to her from the Tower of London. In various 19th-century accounts of the "Essex" and Warner rings, Mary's gift and the verses are associated incorrectly with her marriage to ...
Rose de France" is defined by its markedly light shade of the purple, reminiscent of a lavender / lilac shade. These pale colors were once considered undesirable, but have recently become popular due to intensive marketing. [8] Green quartz is sometimes called green amethyst; the scientific name is prasiolite. [9]
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