Does someone know what any of these are?

[dave r]

Hi there. Shell one is a fossil called an Ammonite, it is actually the shell of an extinct member of the squid family.
The necklace has been made from pieces of Turbo shell but I could not say from which species. It does have some green colour so could be Turbo marmoratus or crassus. The bracelet looks to be made from mother of pearl which could really be one of many shells, the usual suspect is one of the pearl shells, Pinctada.
Picture 4 looks to be Turbo chrysostomus, the Gold-mouth Turban but I would need to see the aperture (opening)to be sure.Number 5 is a spiny cockle  (Acanthocardium sp.) but without a better quality photo again I can't sday which species. Lastly you have a specimen of Bolinus brandaris, the Purple Dye Murex from the Mediterranean.
Hope this is of some help,
Dave