|Dimensions (mm)||108 x 96 x 28mm|
|Weight (carats)||1619 carats|
Curlew Emerald Mine, Shaw River District, East Pilbara Shire, Western Australia, Australia
HAS PURPLE FLOURITE INCLUSION
ON HOST ROCK
Specimens can consist Light green beryl crystals to green beryl coloration, with minor dark biotite specks mica ,schist and purple fluorite inclusions.
The dark mica schists within the quartz veins and pegmatites contain gem quality emerald crystals and green beryl. As is typical of Western Australian emerald
Nearly all production of emerald in Western Australia has been from a deposit at Poona but there are beryl and emerald deposits at Menzies and in the Pilbara region, south of Port Hedland.
Screens are used to sort the emeralds by size and then silt and clays are washed away to expose the emerald-bearing schist. No other chemicals are used in this process. Any schist or other rock still attached to the emerald is removed manually in a process called cobbing. Higher quality materials can be cleaned using high-pressure air.
Emeralds have been commercially mined in Australia in three main deposits Poona and Menzies in Western Australia, and Emmaville in New South Wales. The emeralds are usually in rocks among layers of other minerals such as mica. Open pit mining or terrace mining are the most common methods. Miners dig a pit with shovels, excavators or other earth moving equipment, depending on the scale of the mine. If the emerald-bearing ore is beneath a substantial cover of soil and rock, explosives might be used to remove this material. Sometimes high pressure water is used to blast the rock to reveal mineral bearing rocks. Tunnels are also used to extract emeralds from deeper rock layers.
The Gemstone Sheriff program allows our members to request an audit on any auction, which is completed by an independent Gemologist who assesses the accuracy of the item description and pictures.
|Starts||14th Jun 2021 7:38pm PDT|
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