Apparently Druzy is a coating of crystals found on rock surfaces. It occurs when water is forced to fill a porous area of rock. When it dries, minute crystals are formed.
Anyway, Science lesson over, it looks good in statement jewellery pieces like this from Trisori (£119)
... and this super sparkly pendant (£29.99 Satin Silver)
and this from ebay
None of these pieces are really for me (although I wouldn't say no to the first ring) but I'm going to look out for them in the future.
What do you think?