I wrote recently of my enjoyment of Selvapiana's Chianti Rufina 2017. A reorder of this wine, this time from TWS, came under screwcap, giving a rare chance to compare the two closures. It remains recognisably the same wine under screwcap but the difference is remarkable, there seems so much more amplitude and aromatic distinction from the version under Diam, though of course there could be a thousand other things that make the difference and for all I know the bottlings could have been months apart. The screwcap version shows no reduction whatever but neither does it show any positive development. It would be interesting to see how things are in five years time but at the moment the Diam provides a much more enjoyable drink.