Wine diamonds

[oldbloke]

Had a bottle of nettle (or was it dandelion?) with Sunday dinner last weekend.
Found 3 crystals in my glass (last out of the bottle)
Marginally concerned (it tasted fine) I googled.
And found they're a tartrate and while usually filtered out of commercial stuff, are actually sought after as a sign of quality by some of the cognoscenti!
My lad took them into school for show&tell!
(I gave his form teacher a small bottle of coffee wine for christmas, she probably thinks I'm a total alcoholic!)

[danbrew]

Tartrate crystals form as a result of cold stabilisation which comes about following a good period of ageing and prolonged storage in cool/cold conditions so yes I would say it means your wine is well looked after.

The ability to cold stabilise crystals out of solution is an advantage of using tartaric acid in wine making rather than cirtic or malic because if a wine is too acidic it's one of the few ways of properly reducing the acidity...