Beryl: “Numerous colored varieties with Beryl are used in jewelry and for the ornamentation. The green Beryl is named emerald; the blue Beryl, the aquamarine. The Beryls of the other colors are described under the simple name "beryl". This naming diverts from a Sanskrit term and indicated obviously always these gemstones.”
Opal: " the characteristic of the noble opal is its iridescence, that is made iridescent reflections reminding the rainbow, which modify according to the angle of vision."
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