If the master glassmaker is Dalla Valentina, the price should be pretty high. Not less than 4000 Euro retail price.
Up to some years ago, this master glassmakers was used to name "Linea Valentina" the entry level products (anyway with high quality standards), like filigree bottles, small bowls and similar piece.
Than he used his own name for more complex pieces in an higher price range. Pretty famouse his tourtle shells made with big murrina glass or his multicolor compositions for glass fish.
For sure of the calcedonio scultures there is the Dalla Valentina signature.