Executive Minerals

Johannesburg, South Africa

• MOQ 1 Kilogram

We are offering emerald rough stone though it is the green variety of beryl, not all gem-quality green beryls are called emeralds; yellow-green stones are called "heliodors;"soft blue-green or even pale green specimens are called "aquamarines." the typical color of emerald is a beautiful, distinct hue known as "emerald green" and is due to traces of chromium, sometimes vanadium, in the crystal structure. Emeralds can be light or dark green, bright green or leaf-green. The color is very stable against light and heat, and only alters at 700-800 c. All emeralds are brittle and combined with internal stresses, are sensitive to pressure; care must be taken in heating them. They are resistant to chemicals with the exception of fluoric acid. The emerald color is virtually unmistakable, only equalled by some very rare specimens of jadeite jade which is less transparent and has different physical properties. All emeralds contain inclusions, although in the best quality stones, these are very faint and not visible to the naked eye. The vitreous luster is not outstanding, and is strongest in medium-light stones with few inclusions. Inclusions in emerald can be highly distinctive: a bubble of gas in a liquid, within spindle-shaped, or more rarely, truncated, prismatic cavities; birefringent, circular plates of mica; multifaceted pyrite crystals or calcite rhombohedra. But a microscope is almost always needed to recognize them. These are not classified as faults, but are evidence as to the genuineness of the stone as compared with synthetic and other imitations. Experts refer to these inclusions as "jardin." the biggest and most beautiful emeralds come from the chivor and muzo mines of colombia. Mined by the incas, the muzo deposit was abandoned, then rediscovered in the 17th century. The mine yields fine quality stones of a deep green color.

We are offering diamonds from the mines. We bring to the world the best quality and grade of processed and unprocessed diamonds