Corks vs screw caps: the real difference

No. Australia and New Zealand use screw caps for nearly all their wines, including premium and icon-level bottles. The closure is the winemaker's choice — not a quality signal. A great Malbec under screw cap will beat a mediocre Malbec under cork every time.

Because natural cork allows a very slow, controlled amount of oxygen into the bottle — about 1 milligram per year. That tiny ingress is what lets serious reds evolve over 10–30 years. For ageworthy wines, no proven substitute has matched cork yet.

A faulty bottle caused by TCA, a compound formed when chlorine reacts with natural fungi in cork bark. Wine smells of wet cardboard or damp basement. About 3–5% of cork-sealed bottles are affected. If you suspect cork taint, ask for a replacement.

Yes, but the debate is alive. Wines under screw cap age more slowly. Some producers believe screw-cap wines age beautifully, just differently. Others say true 20-year evolution still requires cork. Modern Saranex-lined screw caps support 5–10 years of aging well.

Synthetic corks are mostly for inexpensive early-drinking wines. DIAM is a technical cork made from cork particles cleansed of TCA — premium quality with calibrated oxygen exchange, increasingly used for serious wines that want cork's behavior without taint risk.