1930's Platinum Diamond Cocktail Ring

An unusual 1930's dress ring which we have re-set with three blue topaz gem stones. Leading from the topaz are curving diamond shoulders (six graduated in each) almost like a 'V'.  There is also three French cut rubies set on either side.  Would have to guess that the ring has been handmade as no hallmark but testing as platinum.  The ring at 'V' measures 16mm from the top topaz to the bottom topaz.  Finger size K1/2.   Weight 7.7g.  Total diamond content estimated as 0.30ct.
PLEASE NOTE: This item is available to view at the centre