Help With Jewellery!

[DonnaLouise26881]

I have been passed down some jewellery from my grandparents. 2 rings. One is silver and the other is gold which I'm certain has a 750 stamp on it but also has another kind of metal on it too. I have googled trying to find out more about the rings but there is just so much to go through. Is there anyone here that has any knowledge or experience with jewellery or who can point me in the right direction as to where to get help/advice.

Thankyou!

[Togo]

It is 18 carat gold. The 750 = 75% gold and other alloys. The other alloys give a little strength to the gold for everyday wear.