The Andamooka Opal is a
famous opal
Opal is a hydrated amorphous form of silica (SiO2·''n''H2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline form ...
which was presented to
Queen Elizabeth II in 1954 on the occasion of her first visit to
South Australia
South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories ...
. The opal was mined in
Andamooka in 1949. The opal was cut and polished by John Altmann to a weight of . It displays a magnificent array of reds, blues, and greens and was set with diamonds into an 18
karat
The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of ''fine metal'' therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase hardne ...
(75%)
palladium
Palladium is a chemical element with the symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1803 by the English chemist William Hyde Wollaston. He named it after the asteroid Pallas, which was itself na ...
necklet.
See also
*
List of individual gemstones
A number of gemstones have gained fame, either because of their size and beauty or because of the people who owned or wore them.
A list of famous gemstones follows.
Alexandrites
* Smithsonian museums' Alexandrite, the largest cut alexandrit ...
Other notable individual opals:
*
Galaxy Opal
* Glorious Jubilee
*
Flame Queen Opal
The Flame Queen Opal is perhaps the most famous of all opals. It is the best-known example of “eye-of-opal”, an eye-like effect created when opal in-fills a cavity.
The Flame Queen's flat central raised dome flashes red or gold depending on t ...
*
Halley's Comet Opal
*
Olympic Australis Opal
References
Individual opals
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