Wine Diamonds or Tartrates Crystals in Red Wine

Tartrates crystals in red wine, also known as wine diamonds or wine crystals, are a natural occurrence that can sometimes be found in bottles of red wine. These crystals are made up of potassium bitartrate, which is a harmless substance and a natural byproduct of winemaking.

Tartrates crystals form when tartaric acid, a natural component of grapes, combines with potassium in the wine and precipitates out of solution. This can happen when the wine is exposed to cold temperatures, such as during storage in a cellar or refrigerator.

It's important to note that tartrates crystals are not a sign of poor quality or spoilage in wine. In fact, they are often seen as a mark of authenticity and minimal intervention in winemaking. Winemakers can choose to filter out these crystals before bottling, but some prefer to leave them in as they are harmless and do not affect the taste or quality of the wine.

When tartrates crystals are present in red wine, they may appear as small, white or cream-colored crystals at the bottom of the bottle or on the cork. They can also sometimes be seen clinging to the inside of the bottle.

If you come across tartrates crystals in your red wine, there's no need to be alarmed. Simply pour the wine carefully, leaving the crystals behind in the bottle or decant the wine to separate them from the liquid. Enjoy your wine as usual, knowing that these crystals are a natural and harmless part of the winemaking process.

 - Water 'N' Wine Stellarton

Additional notes from our supplier:
RJS Craft Winemaking (pdf)