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 May
(Emerald)
- Light green to hunter green ranges in color.
- Moh's scale of hardness 7.5-8
Technically, emeralds belong to the mineral group called
beryl. This is the same group to which aquamarine belongs.
In fact, light specimens of emerald known as green beryl
are often heat-treated, in which they become aquamarine.
Emeralds are known for having obvious flaws. In fact, synthetics
used in emerald jewelry are sometimes produced with apparent
flaws in order to appear more realistic. Often, emeralds
are treated with oil, fracture-filling or even irradiation
to hide certain flaws.
Emerald jewelry contains stones from around the world, though
most commonly they come from mines in Columbia, Brazil,
South Africa, Russia and North Carolina.
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