GIL Certified 23.52 Cts Unique Copper Bearing Tourmaline ~ Brazil

Item Information

Dimensions (mm) 19.24 x 17.31 x 9.53mm
Weight (carats) 23.52 carats
No Treatment

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Copper-bearing tourmaline from Mozambique was first recovered in 2001, but its Cu content was not recognized until 2003, and it was not widely sold with its Mozambique origin disclosed until 2005. It has been mined from alluvial deposits in an approximately 3 km2 area near Mavuco in the eastern portion of the Alto Ligonha pegmatite district. Most of the production has come from arti- sanal mining, with hand tools used to remove up to 5 m of overburden to reach the tourmaline-bearing layer. The stones exhibit a wide range of colors, typically pink to purple, violet to blue, and blue to green or yellowish green. Heat treatment of all but the green to yellowish green stones typically produces Paraíba-like blue-to-green hues by reducing absorption at ~520 nm caused by the
presence of Mn3+. The gemological properties are typical for Cu-bearing tourmaline (including material from Brazil and Nigeria); the most common inclusions consist of partially healed fractures and elongate hollow tubes. With the exception of some green to yellow-green stones, the tourma-lines examined have relatively low Cu contents and very low amounts of Fe and Ti. Mechanized mining is expected to increase production from this region in the near future.

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Pricing & Details

Bid Increment $1
Starting Bid $1
Auction ID 827825
Watchers 11 watching
Viewed 1,486 times
Starts 24th Nov 2020 12:25am PST
Ends 29th Nov 2020 12:25am PST

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