how do you tell the difference between gold roman coins and bronze roman coins?

How do you?

 

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One is... gold?

 

That is not a flippant answer but the full truth. Any collector needs to become familiar with gold before buying any coin claiming to be gold. Gold has a distinct feel even more than its color. Even when gold is debased by about half (which ancient coins rarely were), it retains this smoothness and weight that brass, copper, bronze and anything else yellow just don't have. I suggest going to a coin store and becoming familiar with gold if they have anything unslabbed and circulated or to a jeweler wher you might actually see the difference first hand.

 

I don't know. Maby. One was silver. One was
SiVerde.

 

'SiVerde"

What is that?

Also, if the coin is not obviously gold, then it ain't gold.

Even then, if you think it is don't buy it unless you get it certified.

 

I'd there any coins made from white gold?

 

There are coins made from an alloy of gold and silver known as electrum. That color is light gold and the gold feel remains. White gold is alloyed with nickel or platinum and sometimes rhodium plated to make it whiter. I am not aware of ancient coins using it. There are nickel ancients but that alloy is with copper and resembles US nickel coins.

 

In Greek and Bosporus coinage there are several of these 'white gold' electrum coins.
I had several Severus Alexander staters, containing so few gold, they appear to be silver. Others had a very light golden toning. Only 2 were more or less 'gold'... 'Greek Imperial coins' by D. Sear marks them as 'AR staters'.
End 2nd and early 3rd century, most of the Bosporus staters are 'electrum'. Some of them are quite golden, some are visually pure silver... still being marked in GIC as 'electrum'...