Absolutely 100% Isle of Wight Studio Glass.
These pedestalled bowls were only produced for a short period of time - fairly scarce. :thup:
The bits you refer to as being bluey are parts where the silver foil has reacted with the glass a bit more than intended - so possibly made before the Azurene technique was fully "sorted". I think it's a beautiful effect - although it can go a bit wonky - Ive got a massive cylinder, where there is a thick band of the bluey effect around the top - it's prettier when it's random!
I bought mine on ebay - and the seller had done their homework. :thup:
It arrived with it's original certificate, with a facsimile of Michael Harris' signature, and a printout of the response from IoWSG to the seller's query about it.
This was written by Jo Silvester, and states that, yes, it is IoWSG, probably from mid-late '80s, the shape is no longer made. This response is dated '03.