Rough Opal

December 17, 2009

Boulder and sandstone opal pt 2

Filed under: Boulder opal, Boulder opal rough — Tags: , , , — admin @ 10:38 am

As I mentioned in my previous entry, boulder opal did not have much of a market before 1970. Prior to that time, only opal actually cut out of the boulder was offered for sale.

However, even this boulderless-opal found buyers. According to the book Opals by Fred Ward, these opal first appeared in 1873 at a London gem exhibition, and were so successful that several leases, mines and sales were documented between that year and 1888.

Ward gives Tully Wollaston credit for introducing Queensland sandstone opal to the rest of the world. In 1888, Wollaston set out for Queensland with two other men, to find Joe Bridle, the first miner who found these opals, apparently. Wollaston purchased all he could, then took the material to England to sell. It took some persistence in the face of rejection, but finally some London jewelers purchased the material, and the market expanded rapidly after that, for a number of years – before the other opal fields in Australia made their debut.

December 10, 2009

Boulder and sandstone opal pt 1

Filed under: Boulder opal, Boulder opal rough — Tags: , , — admin @ 8:46 am

Sandstone and boulder opal have been mined in Queensland, Australia since 1872.

Sandstone opal, which is also found in Mintabie and Andamooka, forms opal that is unattached, whereas boulder opal is formed attached to ironstone.

Australian gem associations define boulder opal in this way:
“Boulder opal is presented in one piece, where the opal is naturally attached to the host rock in which it was formed and the host rock is of a different chemical composition composition.”

The earliest miners would cut or break the opal away from the ironstone, and would then sell it as Queensland Opal. If the opal broke when it was being separated, it would simply be thrown away.

It was not until the 1970s that boulder opal found a market. Today, the best pieces of boulder opal can fetch as much high prices as even black opal.

November 21, 2009

Boulder opal rough on auction

Filed under: Boulder opal rough — Tags: , — admin @ 12:29 pm

Below are a few samples of Boulder opal rough on auction at http://www.opalauctions.com, Check out the link above to see everything avaiable.

AUSTRALIAN BOULDER OPAL 38.40CTS – SS 3062
opalplus
10.00 - - 6 minutes 15 seconds
AUSTRALIAN BOULDER OPAL 10.50 CTS – SS 3070
opalplus
25.00 - - 6 minutes 15 seconds
AUSTRALIAN BOULDER OPAL 11.20 CTS – SS 3074
opalplus
22.00 - - 6 minutes 15 seconds
AUSTRALIAN BOULDER OPAL 7.20 CTS – SS 3075
opalplus
25.00 - - 6 minutes 15 seconds

November 17, 2009

Yowah Opal Rough On Auction Right Now

Filed under: Boulder opal rough, Yowah — Tags: , , — admin @ 10:12 am

Below is a sample of Yowah Opal Rough on auction at opalauction.com. We don’t link to each indvidual auction, as the links become broken over itme, but check the link above to go to the auction site to see what’s still available.

Grade B Yowah Opal Rough 29.7 CTS [RYB 112]
Twentyfirstopals
6.99 - - 11 hours 50 minutes
Grade B Yowah Opal Rough 73.8 CTS [RYB 153]
Twentyfirstopals
8.99 - - 11 hours 50 minutes
Grade B Yowah Opal Rough 85.6 CTS [RYB 157]
Twentyfirstopals
7.50 - 85.6 11 hours 50 minutes
Grade B Yowah Opal Rough 51.3 CTS [RYB 115]
Twentyfirstopals
9.99 - - 11 hours 50 minutes

November 12, 2009

Boulder Opal Rough at Auction right now

Filed under: Boulder opal rough — Tags: , , — admin @ 4:39 am

Below is an example of boulder opal rough on auction at opalauctions.com.

The lots below aren’t linked, since they become broken once the auction is over, but if you’ll visit the site via the link above, you’ll see all boulder rough opal available.

BOULDER ROUGH FROM QUILPIE 62 CTS [BY180 ]
SEDA ROUGH OPALS
34.00 - - 13 hours 22 minutes
BOULDER OPAL ROUGH 16.10 CTS FJ 13788 (FO-TBO)
FOSSIL OPALS
45.00 - 16.10 13 hours 22 minutes
BOULDER ROUGH OPAL 305 CTS *DTO* DT-308
dreamtimeopals
25.00 - 305 13 hours 22 minutes
BOULDER ROUGH OPAL170 CTS *DTO* DT-309
dreamtimeopals
25.00 - 170 13 hours 22 minutes
BOULDER ROUGH -41CTS [By1293]
SEDA ROUGH OPALS
19.99 - 41 13 hours 22 minutes

Powered by WordPress