Help Identify Coins

Hello and welcome to the forum.
Now that's a crime, treating coins like that. Anyway, picture 1:
1) 1892, 4 Ducat, Gold, KM# 2276, Fine = $285.00
2) 1868 A, 4 Ducat, Gold, KM#2274, Fine = $350.00
3)?
4) 1909, 4 Ducat, Gold, KM# 2276, Fine = $275.00
5)?
6)?
The values are in American dollars and are if the coins are genuine and in fine cond.
Unfortunately, yours are not in fine cond., at least the ones that were used for jewelry. I would not even hazard a guess for there value. Spot value for gold at this moment is $666.20 / Oz. and you should have a total of 41.8908 g. in weight

The others appear to be Ottoman Empire trade coins. I suspect they are genuine pieces, but holed and plugged because of being worn like on a necklace etc. This was actually pretty common thing to happen to these coins during that time.

My impression this morning was that they looked like they were all made from the same brass metal but I hope that I am wrong and that these are real gold. Since you have the expected weights now, it should be a fairly simple matter to weigh the coins together and/or separately to see if the weights are what they should be for real gold.