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Reputation Activity
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Pete got a reaction from Muncle for a wiki, Troy Ounce
Not to be confused with an ounce, a Troy ounce is used to measure the weight of PMs and is exactly 31.1034768 grams so approximately 10% heavier than a normal ounce.
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Pete got a reaction from silvergaga for a wiki, Obverse and Reverse
This terminology is used to reference the face of a coin and is often confusing so here is a simple description.
The obverse is the "head" so for a UK coin it would show a portrait of the Queen.
for non portrait coins it's the official side and usually non varying within a set. eg coat of arms side.
The "reverse" is the backside or tail of the coin.
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Pete got a reaction from nunoelias for a wiki, Troy Ounce
Not to be confused with an ounce, a Troy ounce is used to measure the weight of PMs and is exactly 31.1034768 grams so approximately 10% heavier than a normal ounce.
-
Pete got a reaction from spoon for a wiki, Specific Gravity
This can get very technical but essentially specific gravity is a number that determines the average density of the item
being tested. it can then be matched up to a table to determine the purity of possible gold and silver content.
fine Gold has a specific gravity of 19.3 and fine silver 10.49.
These numbers are also known as densities measured grams per cubic centimeter.
Many stackers are concerned about fakes.
Having confirmed weights and dimensions another test is to make a specific gravity test.
Sometimes measuring coin thickness relies on averages - centre thickness, rim thickness etc and some wear and tear perhaps so to eliminate doubt make another measurement - the SG test.
One quick way to measure SG is to use precise electronic scales and follow these steps -
1. Weigh your coin in grams e.g. 31.2g
2. Place a paper ( or lightweight ) cup on the scales and fill half full with cold water.
3. Tare i.e. zero the scales
4. Support your coin in a cradle ( cross ) of very fine thread and dip it into the water ensuring it is completely submerged AND not touching the bottom.
5. Read the scales e.g. 2.97g
6. The ratio of 31.2 / 2.97 = 10.5 confirming silver
Metal
Density
Gold
19.3
Silver
10.4 to 10.6
Platinum
21.4
Palladium
12.0
Copper
9.0
9ct
10.9 to 12.7
14ct
12.9 to 14.6
18ct Yellow
15.2 to 15.9
18ct White
14.7 to 16.9
22ct
17.7 to 17.8
Sterling Silver
10.2 to 10.3
950 Platinum
20.1
This gets a tad more complicated with say a gold sovereign.
You need to work out ratios knowing that the gold content is 22/24 and the other part 2/24 is either silver or copper.
whilst the sg test works well for silver due to it's relative low value and the
possible cost of ensuring a counterfeit passes this test. it's different for
gold which has a close density replacement in the form of tungsten(sg 19.6).
thus the sg test alone should not confirm gold on larger pieces where
drilling and tungsten filling is known to exist.
-
Pete got a reaction from Arganto for a wiki, Specific Gravity
This can get very technical but essentially specific gravity is a number that determines the average density of the item
being tested. it can then be matched up to a table to determine the purity of possible gold and silver content.
fine Gold has a specific gravity of 19.3 and fine silver 10.49.
These numbers are also known as densities measured grams per cubic centimeter.
Many stackers are concerned about fakes.
Having confirmed weights and dimensions another test is to make a specific gravity test.
Sometimes measuring coin thickness relies on averages - centre thickness, rim thickness etc and some wear and tear perhaps so to eliminate doubt make another measurement - the SG test.
One quick way to measure SG is to use precise electronic scales and follow these steps -
1. Weigh your coin in grams e.g. 31.2g
2. Place a paper ( or lightweight ) cup on the scales and fill half full with cold water.
3. Tare i.e. zero the scales
4. Support your coin in a cradle ( cross ) of very fine thread and dip it into the water ensuring it is completely submerged AND not touching the bottom.
5. Read the scales e.g. 2.97g
6. The ratio of 31.2 / 2.97 = 10.5 confirming silver
Metal
Density
Gold
19.3
Silver
10.4 to 10.6
Platinum
21.4
Palladium
12.0
Copper
9.0
9ct
10.9 to 12.7
14ct
12.9 to 14.6
18ct Yellow
15.2 to 15.9
18ct White
14.7 to 16.9
22ct
17.7 to 17.8
Sterling Silver
10.2 to 10.3
950 Platinum
20.1
This gets a tad more complicated with say a gold sovereign.
You need to work out ratios knowing that the gold content is 22/24 and the other part 2/24 is either silver or copper.
whilst the sg test works well for silver due to it's relative low value and the
possible cost of ensuring a counterfeit passes this test. it's different for
gold which has a close density replacement in the form of tungsten(sg 19.6).
thus the sg test alone should not confirm gold on larger pieces where
drilling and tungsten filling is known to exist.
-
Pete got a reaction from RogerBelmar for a wiki, Obverse and Reverse
This terminology is used to reference the face of a coin and is often confusing so here is a simple description.
The obverse is the "head" so for a UK coin it would show a portrait of the Queen.
for non portrait coins it's the official side and usually non varying within a set. eg coat of arms side.
The "reverse" is the backside or tail of the coin.
-
Pete got a reaction from Agpanda for a wiki, Troy Ounce
Not to be confused with an ounce, a Troy ounce is used to measure the weight of PMs and is exactly 31.1034768 grams so approximately 10% heavier than a normal ounce.
-
Pete got a reaction from Snapcap44 for a wiki, Troy Ounce
Not to be confused with an ounce, a Troy ounce is used to measure the weight of PMs and is exactly 31.1034768 grams so approximately 10% heavier than a normal ounce.
-
Pete got a reaction from SILVERFINGER for a wiki, Specific Gravity
This can get very technical but essentially specific gravity is a number that determines the average density of the item
being tested. it can then be matched up to a table to determine the purity of possible gold and silver content.
fine Gold has a specific gravity of 19.3 and fine silver 10.49.
These numbers are also known as densities measured grams per cubic centimeter.
Many stackers are concerned about fakes.
Having confirmed weights and dimensions another test is to make a specific gravity test.
Sometimes measuring coin thickness relies on averages - centre thickness, rim thickness etc and some wear and tear perhaps so to eliminate doubt make another measurement - the SG test.
One quick way to measure SG is to use precise electronic scales and follow these steps -
1. Weigh your coin in grams e.g. 31.2g
2. Place a paper ( or lightweight ) cup on the scales and fill half full with cold water.
3. Tare i.e. zero the scales
4. Support your coin in a cradle ( cross ) of very fine thread and dip it into the water ensuring it is completely submerged AND not touching the bottom.
5. Read the scales e.g. 2.97g
6. The ratio of 31.2 / 2.97 = 10.5 confirming silver
Metal
Density
Gold
19.3
Silver
10.4 to 10.6
Platinum
21.4
Palladium
12.0
Copper
9.0
9ct
10.9 to 12.7
14ct
12.9 to 14.6
18ct Yellow
15.2 to 15.9
18ct White
14.7 to 16.9
22ct
17.7 to 17.8
Sterling Silver
10.2 to 10.3
950 Platinum
20.1
This gets a tad more complicated with say a gold sovereign.
You need to work out ratios knowing that the gold content is 22/24 and the other part 2/24 is either silver or copper.
whilst the sg test works well for silver due to it's relative low value and the
possible cost of ensuring a counterfeit passes this test. it's different for
gold which has a close density replacement in the form of tungsten(sg 19.6).
thus the sg test alone should not confirm gold on larger pieces where
drilling and tungsten filling is known to exist.
-
Pete got a reaction from kimchi for a wiki, Specific Gravity
This can get very technical but essentially specific gravity is a number that determines the average density of the item
being tested. it can then be matched up to a table to determine the purity of possible gold and silver content.
fine Gold has a specific gravity of 19.3 and fine silver 10.49.
These numbers are also known as densities measured grams per cubic centimeter.
Many stackers are concerned about fakes.
Having confirmed weights and dimensions another test is to make a specific gravity test.
Sometimes measuring coin thickness relies on averages - centre thickness, rim thickness etc and some wear and tear perhaps so to eliminate doubt make another measurement - the SG test.
One quick way to measure SG is to use precise electronic scales and follow these steps -
1. Weigh your coin in grams e.g. 31.2g
2. Place a paper ( or lightweight ) cup on the scales and fill half full with cold water.
3. Tare i.e. zero the scales
4. Support your coin in a cradle ( cross ) of very fine thread and dip it into the water ensuring it is completely submerged AND not touching the bottom.
5. Read the scales e.g. 2.97g
6. The ratio of 31.2 / 2.97 = 10.5 confirming silver
Metal
Density
Gold
19.3
Silver
10.4 to 10.6
Platinum
21.4
Palladium
12.0
Copper
9.0
9ct
10.9 to 12.7
14ct
12.9 to 14.6
18ct Yellow
15.2 to 15.9
18ct White
14.7 to 16.9
22ct
17.7 to 17.8
Sterling Silver
10.2 to 10.3
950 Platinum
20.1
This gets a tad more complicated with say a gold sovereign.
You need to work out ratios knowing that the gold content is 22/24 and the other part 2/24 is either silver or copper.
whilst the sg test works well for silver due to it's relative low value and the
possible cost of ensuring a counterfeit passes this test. it's different for
gold which has a close density replacement in the form of tungsten(sg 19.6).
thus the sg test alone should not confirm gold on larger pieces where
drilling and tungsten filling is known to exist.
-
Pete got a reaction from MickD for a wiki, Specific Gravity
This can get very technical but essentially specific gravity is a number that determines the average density of the item
being tested. it can then be matched up to a table to determine the purity of possible gold and silver content.
fine Gold has a specific gravity of 19.3 and fine silver 10.49.
These numbers are also known as densities measured grams per cubic centimeter.
Many stackers are concerned about fakes.
Having confirmed weights and dimensions another test is to make a specific gravity test.
Sometimes measuring coin thickness relies on averages - centre thickness, rim thickness etc and some wear and tear perhaps so to eliminate doubt make another measurement - the SG test.
One quick way to measure SG is to use precise electronic scales and follow these steps -
1. Weigh your coin in grams e.g. 31.2g
2. Place a paper ( or lightweight ) cup on the scales and fill half full with cold water.
3. Tare i.e. zero the scales
4. Support your coin in a cradle ( cross ) of very fine thread and dip it into the water ensuring it is completely submerged AND not touching the bottom.
5. Read the scales e.g. 2.97g
6. The ratio of 31.2 / 2.97 = 10.5 confirming silver
Metal
Density
Gold
19.3
Silver
10.4 to 10.6
Platinum
21.4
Palladium
12.0
Copper
9.0
9ct
10.9 to 12.7
14ct
12.9 to 14.6
18ct Yellow
15.2 to 15.9
18ct White
14.7 to 16.9
22ct
17.7 to 17.8
Sterling Silver
10.2 to 10.3
950 Platinum
20.1
This gets a tad more complicated with say a gold sovereign.
You need to work out ratios knowing that the gold content is 22/24 and the other part 2/24 is either silver or copper.
whilst the sg test works well for silver due to it's relative low value and the
possible cost of ensuring a counterfeit passes this test. it's different for
gold which has a close density replacement in the form of tungsten(sg 19.6).
thus the sg test alone should not confirm gold on larger pieces where
drilling and tungsten filling is known to exist.
-
Pete got a reaction from boon for a wiki, Mule
In numismatics, a mule is a coin minted with obverse and reverse designs in error and can make them highly collectible at often high premiums depending on rarity.
A recent example in early 2014 by the Royal Mint was the mix-up of dies resulting in a run of fine 1 oz silver coins where Britannia and Lunar Horse were incorrectly stamped and released before the errors were spotted. The Lunar Horses were struck with the denticled Britannia obverse while the Britannias were struck with the non-denticled Lunar Horse obverse.
Early sales on eBay saw prices of almost £1,000 for each of these coins but prices quickly dropped to the £100 or less.
There are still mules listed for sale with asking prices of several hundred pounds.
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Pete got a reaction from ApisMellifera for a wiki, Obverse and Reverse
This terminology is used to reference the face of a coin and is often confusing so here is a simple description.
The obverse is the "head" so for a UK coin it would show a portrait of the Queen.
for non portrait coins it's the official side and usually non varying within a set. eg coat of arms side.
The "reverse" is the backside or tail of the coin.
-
Pete got a reaction from ChrisSilver for a wiki, Obverse and Reverse
This terminology is used to reference the face of a coin and is often confusing so here is a simple description.
The obverse is the "head" so for a UK coin it would show a portrait of the Queen.
for non portrait coins it's the official side and usually non varying within a set. eg coat of arms side.
The "reverse" is the backside or tail of the coin.
-
Pete got a reaction from ChrisSilver for a wiki, Troy Ounce
Not to be confused with an ounce, a Troy ounce is used to measure the weight of PMs and is exactly 31.1034768 grams so approximately 10% heavier than a normal ounce.
-
Pete got a reaction from ApisMellifera for a wiki, Specific Gravity
This can get very technical but essentially specific gravity is a number that determines the average density of the item
being tested. it can then be matched up to a table to determine the purity of possible gold and silver content.
fine Gold has a specific gravity of 19.3 and fine silver 10.49.
These numbers are also known as densities measured grams per cubic centimeter.
Many stackers are concerned about fakes.
Having confirmed weights and dimensions another test is to make a specific gravity test.
Sometimes measuring coin thickness relies on averages - centre thickness, rim thickness etc and some wear and tear perhaps so to eliminate doubt make another measurement - the SG test.
One quick way to measure SG is to use precise electronic scales and follow these steps -
1. Weigh your coin in grams e.g. 31.2g
2. Place a paper ( or lightweight ) cup on the scales and fill half full with cold water.
3. Tare i.e. zero the scales
4. Support your coin in a cradle ( cross ) of very fine thread and dip it into the water ensuring it is completely submerged AND not touching the bottom.
5. Read the scales e.g. 2.97g
6. The ratio of 31.2 / 2.97 = 10.5 confirming silver
Metal
Density
Gold
19.3
Silver
10.4 to 10.6
Platinum
21.4
Palladium
12.0
Copper
9.0
9ct
10.9 to 12.7
14ct
12.9 to 14.6
18ct Yellow
15.2 to 15.9
18ct White
14.7 to 16.9
22ct
17.7 to 17.8
Sterling Silver
10.2 to 10.3
950 Platinum
20.1
This gets a tad more complicated with say a gold sovereign.
You need to work out ratios knowing that the gold content is 22/24 and the other part 2/24 is either silver or copper.
whilst the sg test works well for silver due to it's relative low value and the
possible cost of ensuring a counterfeit passes this test. it's different for
gold which has a close density replacement in the form of tungsten(sg 19.6).
thus the sg test alone should not confirm gold on larger pieces where
drilling and tungsten filling is known to exist.