Petra (watch video's tab) is a real miracle because the use of explosives in the extraction of emeralds often breaks the matrix in many small pieces. Nevertheless, as unbelievable as it seems PETRA remained intact and broke a record in the emerald mining in the country since it converted in the largest emerald in matrix ever discovered in Colombia. Once the emeralds are out of the bearing vein they are extracted from the small matrixes and kept in safe bags that are later shown to the mine partners. This was not the case for PETRA because it rather was preserved unbroken, in one unique and exclusive piece. There are more than sixty nicely shaped clear green and translucent emerald crystals glittering against the white calcite vein in the background. Petra was taken by road to the mine administration building then to Bogotá, the world emerald capital, and then to Cartagena where will remain exhibited to our museum visitors.
- How is transparency in emeralds?
- What is a Trapiche Emerald?
- What is an Emerald?
- How Hard are the Emeralds?
- Are the emeralds enhanced?
- How is the measurement of weight for the Emeralds?
- Would the emeralds sparkle as much as the diamonds?
- How to judge the Emeralds?, The four C’s of Emeralds
- How are the emeralds cut?
- Which is the best color of an emerald?
Transparency or clarity is the amount or absence of inclusions within a gemstone. In emeralds is considered clarity type III.
Trapiche emeralds are very rare and are highly priced by collectors. Found only in Colombia from the Muzo or Peñas Blancas mines.
Emerald is the name of a unique green variety of the mineral beryl.
Emeralds are not as hard as diamonds, rubies or sapphires but they are much harder than amethyst, citrine, blue topaz, tanzanite and pearls.
After clean with acids, wash out, cut, polish and soak in alcohol or acetone; All Emeralds are immersed in resins to enhance clarity.
Unit weight for gemstones is called carat (ct.) which is equal to 0,20 grams. Each one is divided into a hundred parts called points (pts.).
Refractive index, is the ratio of the speed of light in the air compare to the speed of light in a gemstone.
The 4 C's of Emeralds: Color, Clarity, Carats & Cut
Most emeralds are cut in a special way, which was developed and named after them: Emerald Cut.
The color is the most important criteria in the valuation of emeralds and it refers to the saturation of green within the gemstone.
PETRA, Largest Colombian Emerald Matrix
Petra is the main atraction at the museum, it is the largest emerald matrix ever unheart in Colombia, it is important not just because it's completly how it was at mine, but also because of the quality of the emerald crystals on it.