Spherical Amethyst (''grapes'')

Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia
Cabinet, 10.1 x 7.6 x 4.3 cm
Start Time: 01/25/2024 8:00:00 pm (CST)
End Time: 02/01/2024 6:45:00 pm (CST)
Auction Closed
Winning Bid: $365

Item Description

Quartz is arguably the most diversified species in the world. It is found in wide variety of styles, habits and colors. Here we have a beautiful example of these unique specimens from Indonesia which are commonly referred to as "Grape Agate" or "Grape Chalcedony" for obvious reasons. They are fairly new to the market, and they are singular as they do not resemble any other Quartz specimens we've seen. They are not Agate or Chalcedony, but in fact they are micro-crystallized on the surface, so this is not a cryptocrystalline variety of Quartz, this is truly purple crystallized Quartz = Amethyst. The pieces were analyzed by Dr. George Rossman at CalTech and determined to be Amethyst due to the microcrystallization. More info on page 101-102 of the Journal of Gemmology https://gem-a.com/jog-volume-36-issue-2 . As you can see, these specimens got their nickname due to the fact that they are purple and genuinely resemble bunches of grapes. Very little of this material seems to be out there now, and perhaps it is drying up. If you missed out on these when they first came out, this is a great opportunity to pick up a really attractive specimen for a great piece. This piece is filled with excellent, translucent, sparkling "balls" or spheroids measuring up to about 4 mm which are tightly intergrown and are visible literally on every side of the specimen. The color is a consistent medium purple hue throughout. The piece is crystallized all over, but there are some contacted points of attachment where it was separated from the pocket wall. There is a lot of Quartz in the world, but these pieces are truly unique and would make a superb addition to any Quartz suite.

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Bidding History

Bid Amount Bid Time
$365 01/29/2024 8:47:07 pm (CST)
$355 01/29/2024 8:47:07 pm (CST)
$315 01/28/2024 4:02:45 pm (CST)
$305 01/28/2024 4:02:31 pm (CST)
$300 01/28/2024 4:02:31 pm (CST)
$260 01/28/2024 2:11:29 pm (CST)
$250 * 01/28/2024 2:11:08 pm (CST)
$250 * 01/28/2024 2:11:08 pm (CST)
$210 01/28/2024 2:10:03 pm (CST)
$200 * 01/28/2024 2:09:42 pm (CST)
$200 * 01/28/2024 2:09:42 pm (CST)
$170 01/28/2024 12:04:43 pm (CST)
$160 01/28/2024 12:04:43 pm (CST)
$150 01/28/2024 12:04:22 pm (CST)
$140 01/28/2024 12:04:22 pm (CST)
$130 01/27/2024 8:36:03 pm (CST)
$120 01/27/2024 8:36:03 pm (CST)
$110 01/27/2024 8:35:57 pm (CST)
$100 01/27/2024 8:35:57 pm (CST)
$90 01/27/2024 8:35:52 pm (CST)
$80 01/27/2024 8:35:52 pm (CST)
$60 01/26/2024 1:09:42 pm (CST)
$50 01/26/2024 12:40:06 pm (CST)
$47 01/26/2024 12:40:06 pm (CST)
$15 01/26/2024 12:20:29 pm (CST)
$10 01/26/2024 1:52:16 am (CST)
* Proxy Bid Battle: In the event of two customers inputting matching proxy bids, the leading bid goes to the earliest of the two proxy bids. Tie winners are shown in bold.