Tiara and Brooch

This tiara and brooch set is of Central European origin. It is in a domed glass display case. It uses the forms of leaves, flowers and berries. Quite simply, how much is the set worth in your estimation?
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please show picture of hallmark.

I’ve had a look all over it and there is no hallmark. How could I find out whether it is silver plated? Is there a simple test or observation I can do?

experience. But that is not a thing you can do just like that.
I smell, observe the feeling in my fingers, The weight with my fingers, dimensions, feeling.
Asid for testing can be bought - easy to use. but you have to scrach down below the surface. Easy enough whn tried a few tims.

But all that is not for someone new in silver. You must contact someone who knows. Try a silversmith or a museum.

I agree that you need an expert to appraise these. So much depends on whether they are silver or not.