Australia has never produced a Sovereign or Half-Sovereign coin as a part of its currency.
Prior to Federation, the Australian colonies produced Sovereign and Half-Sovereign coins for Britain during the later part of the 19th Century, from about 1870.
Also, Sovereign and Half-Sovereign coins were produced at the newly opened Sydney branch of the Royal Mint in about 1855 with the word AUSTRALIA on the reverse. It should be noted that at this period of history, Australia was a very loose confederation of Colonies governed from Britain. Australia had not yet become a country and did not have its own currency.
Irrespective of the Mint or location, "Australian" Sovereigns weigh in at 7.9881 grams, are 1.52 mm thick, have a diameter of 21.05 mm, fineness is 22 carat or 91.67% gold, and the gold content is 7.3224 grams, as per the British standard.
What type of Australian gold coin? Do you refer to a gold coloured coin such as the One and Two Dollar coins, or a bullion coin? If you refer to a bullion coin, please provide the weight and theme of the coin.
None. There is no gold in any Australian general circulation coin.
Assuming that your coin is in mint condition and still in the original packaging, and depending on the year, theme and gold content, your Australian Two Hundred Dollar gold coin might get anything from $420 to $750 AUD.
The Australian Two Dollar coin is made from copper, aluminium and nickel and is of a gold appearance. Very occasionally, some Proof coins are made from silver and issued in sets. The 2000 $2 coin was not one of these. If you have a silver $2 coin, it has been plated. Modified coins are worthless as a collectible.
No. There is no precious metal in any Australian general circulation coin. The Australian One and Two Dollar coins are made from an aluminium-bronze alloy.
The Australian Ten Dollar coin is a Non-Circulating Legal Tender coin issued annually by the Royal Australian Mint in a variety of different metals including gold, silver and bi-metal. The value of any coin would be dependant on the year, the metal and the theme of the coin.
The Australian Koala series of coins were only ever minted in platinum and the Twenty-Five Dollar coin was only ever issued as part of a set.
No. There are no circulating Australian coins with any precious metal in them. The Australian One Dollar coin is made from 92% copper, 6% aluminum and 2% nickel which gives it a pale gold appearance.
The weight of this coin is 8.359 grams and has .24187oz pure gold. This standard is for all Half Eagles from 1839 to 1929.
Your coin is plated. The US has never made a standard half dollar in gold. Unfortunately the plating has destroyed any significant collector value the coin may have had.
An Australian 1984 Two Hundred Dollar gold coin (Koala), uncirculated and in absolute mint condition could fetch up to $420 AUD. There were 49,200 minted. An Australian 1984 Two Hundred Dollar gold coin (Proof)(Koala), uncirculated and in absolute mint condition could fetch up to $440 AUD. There were 12,584 minted. Any valuation presumes that the coin is in the original packaging and remains in mint condition. A reputable coin dealer will be able to give a more accurate valuation.
The standard weight is 33.4 gm for an unworn $20 coin issued from 1849 to 1932.