Emeralds can be found in South America, Rhodesia, Pakistan, India, Africa,
Egypt, Russia and Brazil. These Gemstones are considered to one of the
worlds most popular sought after stones. As a member of the beryl family of
minerals it is commonly known for its rich green color. The beryl mineral
family usually has no color, but emeralds get their color from the presence
of chromium. The name Emerald comes from the Greek word “Smaragdos”
which is translated to means “green stone”.
other precious gemstones, inclusions and small fractures in an emerald
crystal does not detract from the value of the stone. In fact the minor
imperfections found within the stone are what give it “personality"
and prove that the gem is a true stone and not an imitation. The inclusions
are generally small gas bubbles that were trapped during formation, but can
also be iron pyrite or water. Whether a stone is translucent or transparent
depends on the number of inclusions. Thus, only a few inclusions and the
stone will be almost see through. However, a stone with too many inclusions
will appear almost opaque or “cloudy”. The inclusions in an emerald
are generally referred to as a “garden”, but cause the stone to be
fragile or sensitive. So, jewelers in the 17th century
invented the “emerald cut”, which is a rectangular step-cut, to account for
the gem’s easily broken nature.
BY R.WELLER/COCHISE COLLEGE
attempt to minimize the visibility of inclusions a technique referred to as
“clarity enhancement” is generally applied to an emerald stone. Because the
inclusions are usually small gas bubbles or fissures oils are used to fill
them in to make them less visible. The most popular oil used to fill in the
blemishes is cedar wood oil. The oil fills in the bubbles or fissures to
reduce their visibility, but will preserve the clarity of the emerald.
WITH VISIBLE INCLUSIONS
PHOTO BY R.WELLER/COCHISE GEOLOGY
QUALITY EMERALD WITH FEW VISIBLE INCLUSIONS
PHOTO BY R. WELLER/COCHISE COLLEGE
HARDNESS= 7 –
7.50 BIRTHSTONE FOR MONTH OF MAY
MAKES A HIGH QUALITY EMERALD? WEIGHT, PROPORTION, COLOR, BRILLANCE, AND
The spiral inclusion
is caused by tiny water drops trapped during formation
PRINT This is a Natural "Finger Print" formed by tiny liquid-filled bubbles
OF OIL EFFECT This stone has what is called an "Oil Drop" effect. When observed in
daylight the stone is observed with a silky appearance. Light shine through
the stone and gives it a “sunlight” glow.