Thaumasite (rare rough and cut set)

N'Chwaning Mines, Kalahari Manganese Field, Northern Cape, South Africa
Thumbnail, 0.7 x 0.4 x 0.4 cm (crystal), 1.11 carats; 9.67 mm x 5.08 mm (stone)
Start Time: 10/10/2024 7:30:00 pm (CDT)
End Time: 10/17/2024 6:45:00 pm (CDT)
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Current Bid: $249
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Minimum Bids and Increment Bids

The minimum bid for the first bidder is the starting bid of $10 (unless indicated otherwise in special higher-reserve auctions), and from there you can bid incrementally by one or more "bid increments" as you desire. The bid increments are:

$5 for bids of $10 to $50
$10 for bids of $51 to $500
$25 for bids of $501 to $1000
$50 for bids of $1001 to $5000
$100 for bids of $5001 to $10,000
$250 for bids of $10,001 to $25,000
$500 for bids of over $25,000

Item Description

Thaumasite is an uncommon mineral with an unusual chemistry as it has a composition of carbonate, sulphate and hexahydroxysilicate anions. The best and possibly ONLY gem material is found in South Africa. These pieces are the finest known examples of Thaumasite extant, but crystals are rarely over 2 cm, and gems are extremely few and far between. The crystal in this set is a well-formed, gemmy, terminated, hexagonal prism with a classic soft yellow hue. The stone is actually a bit larger than the crystal and has a beautiful "Cut Corner Rectangle" cut with only very very slight inclusions, and is nearly colorless. When one is collecting rare gems, Thaumasite is a must have, and this set would make a great addition to any collection, especially because the stone is over 1 carat in weight.

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Bidding History

Bid Amount Bid Time
$249 10/10/2024 10:27:51 pm (CDT)