Nata Heng Schluessel, GG logo Roland Schluessel, FGA

Emeralds

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The legendary Emerald mine of Muzo in Colombia
276 ct crystal and 19 ct faceted Emerands from Colombia  
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15 mm high Emerald crystal on calcite. Muzo, Colombia
Mining shaft in the La Pita Emerald mine, Colombia  
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The production of raw Emeralds is auctioned
at the mining site
In Colombia, the gem Emeralds are found in white calcite veins  
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The Emeralds are faceted in Bogota
 

Colombian Emeralds from PILLAR & STONE INTERNATIONAL contribute to a
better life in the mining area: "Solutions for a Better Life in Colombia"

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All Emeralds we offer to sell are accompanied with a “Pillar & Stone International Disclosure Scale” indicating the degree and type of enhancement. The oiling and fracture filling of Emeralds goes back several centuries and nowadays more sophisticated resins are used. We supply exclusively Emeralds with no enhancement or with insignificant to minor degree (extent) of colorless oil/resin enhancement.

Define, Disclose, Deliver“ is not just our slogan, it is a promise to our clients.

14WHAT IS A GEM EMERALD?

(see inclusion gallery)

MINERAL SPECIES:

Beryl.

APPEARANCE:

Best Color = Vivid green, not too dark and not too light. A slight bluish overtone is appreciated by a number of specialists and consumers. The best color is pleasant in daylight and incandescent light.
Dichroism = Moderate to strong, green and bluish green.
Fluorescence = Usually inert but may fluoresce orangey red in very fine colors. Fluorescence is insignificant for the Emerald’s appearance.
Transparency = Transparent (if not heavily included).
Clarity = Inclusions are accepted to a certain extent and partly reflect the quality and price of an Emerald.
Brilliancy = Medium to high; may be slightly covered by a too strong color saturation or abundance of inclusions.
Phenomena = Chatoyancy (semitransparent; lower part of the cabochon cut is kept unpolished).

FACET CUTS:

Emerald cut = Ideal and most common shape for Emeralds.
Oval, pear shape, heart shape, cushion cut and marquise cut = Fancy cuts are traded at slightly lower prices.
Rounds and squares = Rare in sizes over 8 mm.

PHYSICAL PROPERTIES:

Hardness = 7 ½ to 8
Toughness = poor to good (caution: heavily included Emeralds have to be handled with special care).
Cleavage = practically none; theoretically very difficult in one direction.
Refractive Index = 1.577 – 1.583
Specific Gravity = 2.72

CLEANING METHODS:

Ultrasonic and Steamer = Never use with Emeralds.
Warm soapy water = Generally safe, but avoid strong detergents and vigorous scrubbing on oiled Emeralds.
Heat = Caution to avoid heat.

STABILITY:

Reaction to heat = May cause additional fracturing or complete breakage.
Reaction to chemicals = Resistant to all acids except hydrofluoric; solvents may drive out oil.
Reaction to Light = Stable.

MAJOR SOURCES:

Colombia, Brazil, Zambia, Pakistan, Afghanistan, Zimbabwe, Madagascar, Russia. In the past: India.

BEST QUALITIES:15

Eye clean Emeralds from Muzo and Chivor in Colombia.

STRONGEST PRICE JUMPS:

Regular price increase for increasing carat weight.
Stones below 1 ct are priced high when compared to larger sizes.

ENHANCEMENTS:

Surface breaking surfaces are filled with oil, wax, resin or other colorless substances. Also filled with color dyes. The FTC requires complete disclosure and explanation of any treatment.

IMITATIONS:

Imitated by synthetics and other man-made imitation stones.

MOST RESEMBLING GEMSTONE:

Tsavorite garnet.

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