Not sure about the clowns being Murano as these were also made elsewhere (I've seen Chinese examples which were very similar and I think there are Romanian versions around too).
You certainly have some nice pieces of Jobling though. The large bowl with the shell design is Jobling's 9000 'Oyster Shell' pattern (yours looks to be the low cupped variant of the large size). The blue crinoline lady is also Jobling and relatively scarce. A 3-part set including the lady, plinth and bowl is shown in Jobling's 1937 catalogue as no. 2596/7. The small blue piece at the back with the circle of holes is a Jobling flower frog (upside down) which would also take a central figure as part of a 4-part centrepiece set.
Arguably the most interesting piece you have though is the blue glass nude figurine. This is quite a rare find. It is a Jobling pattern and examples are included in the collection at Sunderland Museum, however it's not shown in catalogues so either was introduced post-1937 or was an exclusive commission. She may have have come with the frog as part of a centrepiece (though some seem to have been sold separately as one in my collection has had no grinding to the sides of the bung style base and hence won't fit into a frog).
The other pink or grey frosted pieces don't look to be Jobling and I suspect they're quite modern.
Steven
