working out what ct i have????

[Paget Jewellery]

If I have 30g of 12ct gold and 25g of 9ct gold what ct gold do I end up with????? T.I.A

[Gemsetterchris]

That's a tricky mathematical problem

55gms of 9ct. Unless you want to get technical..

[Dennis]

If I have 30g of 12ct gold and 25g of 9ct gold what ct gold do I end up with????? T.I.A

30g of 12ct can be treated in maths as15g 0f 24 ct, or 15g of pure gold.
add 25g of 9/24 (9.375) and you get 24.375 g of pure gold.

24.375g divided by the total weight 40.000gives the proportion of pure gold. multiply that by 24 to get the carat=14.625 ct

That's my answer anyway. Dennis

[ps_bond]

I think there may be an error there, Dennis. It'd be nice to mix low-carat alloys together and come out with a higher carat result, but the laws of physics disagree.
The total weight is 55g.

[CJ57]

Are we not back to this question of it only being able to be hallmarked if it is 9ct so there is only ever going to be 55gms of saleable gold?

[ps_bond]

Yes. We're also back to repeating ourselves having already shown how to calculate it.

[Aurarius]

I'd say you'd end up with something a little over 10.5 ct, but as Chris and Caroline have hinted it would be assayed at 9ct, so there'd be no commercial benefit to you in the actual purity being somewhat higher than this but below the next assaying threshold.

[Dennis]

I think there may be an error there, Dennis. It'd be nice to mix low-carat alloys together and come out with a higher carat result, but the laws of physics disagree.The total weight is 55g.

Yes you're right, this is not alchemy. It should have been10,636ct. But as the others have already said, the assay office will remain unmoved by that. Dennis.

[CJ57]

I'm going to have a wee faint, not sure if it's the thundery heat or the fact we all agree

[Tabby66]

I'm going to have a wee faint, not sure if it's the thundery heat or the fact we all agree

Hahaha......enjoy your wee faint Caroline, this won't happen often