http://geology.com/articles/herkimer-diamonds.shtml
This is an interesting article that I found earlier today. I never knew that Herimer diamonds weren't really diamonds!

Interesting facts. Definitely that to the eyes of many, it looks like real diamonds and only to find out it wasn't. (Well, Duffy the Rockhound seems cute there).

They still very expensive to buy from shops. In Whitby I found them at £5 for one that is only 3mm in size. That is about 10 US Dollars.

That is a new one to me.

nevyn wrote: They still very expensive to buy from shops. In Whitby I found them at £5 for one that is only 3mm in size. That is about 10 US Dollars.

Wow, it's almost 500 Pesos here.

I know, the prices are outrageous.
Then again I guess it is because most people believe they are diamonds and not pieces of quartz that the shops charge so much.

I think they are expensive because doubly terminated quartz crystals are very rare, or hard to find.

I have some more information on Herkimer Diamonds.

These quartz crystals, which formed extremely slowly in small pockets or vugs, have 18 facets (6 sides) and two terminations. They can be found clear, cloudy, or even containing a variety of rare impurities. Impurities (rare and general) can include clusters, scepters, enhydro, phantom, and bridge crystals. An enhydro contains a water pocket within the crystal, and a phantom is a crystal which contains an image of itself within.

The Information above is from here: Wikipedia