Understanding the stamps on gold and calculating the value

10 years 7 months ago - 6 years 9 months ago #46 by roller
Gold is usually stamped 375 for 9 carats, 585 for 14 carats 750 for 18 carats, 875 for 21 carats and 9999 for 24 carats. Where do these numbers come from and what do they mean.

The three digit numbers are the ratio content of the gold over 1000, so for example:

375/1000 = 37.5% gold

The carat measure is over 24 where 24 carat is 100% gold. For example:

37.5% X 24 = 9 carats

87.5% or 875 is 87.5% X 24 = 21 carats

To convert from carat to percentage use the following formula:

Carat / 24 x 100 or

Carat / 24 x 1000 to get the three digit stamp number

To convert from the three digit number to carat use:

Three digit number /1000 X 24

Now pure gold is stamped 9999 which is 999.9/1000 = 99.99% gold.

How do you calculate the scarp gold value for your gold?

If you have 21 carat gold jewellery then it contains 87.5% gold, so let's say it weights 10 grams, then 10 X 87.5% = 8.75 grams of pure gold is present in it.

If the current market price of gold is $1400 for example and that is the price per ounce. A gold ounce refers to a troy once (ozt) which is equivalent to 31.1034768 grams, a standard ounce is usually 28.3495231 grams but a gold ounce is different. A troy ounce comes from the Roman monetary system.

In our piece of jewellery above 10 grams at 21 carat, it contains 8.75 grams of gold.

1 gram is worth $1400/31 = $45

So 8.75 grams are worth 8.75 X $45 = $395

So the formula is:

Weight in grams X three digit stamp / 1000 X ounce market value / 31 = dollar value of scrap gold

Try the online calculator if you can't be bothered using a manual calculator:
Last edit: 6 years 9 months ago by roller.

Please Log in or Create an account to join the conversation.

10 years 3 months ago - 6 years 11 months ago #89 by roller

If you can't be bothered using a calculator or the above post is to much information for you, and all you want to do is quickly calculate your gold's worth then try the Online GOLD PRICE CALCULATOR .

Or you can download an Excel version from here Excel GOLD PRICE CALCULATOR on this link. It's free.

Both should get today's gold price from the internet and let's you enter few numbers and it will show you what your gold is worth in dollars.

This is just for fun so you can get an idea of your gold's worth and I don't recommend you rely on it for your investment or commercial use.
Last edit: 6 years 11 months ago by roller.

Please Log in or Create an account to join the conversation.

Time to create page: 0.200 seconds
Powered by Kunena Forum