London Location

[robingriff]

Near the fruits of St Christopher Hatton's legacy lies the untamed rock.

Within a throw of our stone was once a smooth field, where Wallace and many a heretic met his end.

Barney Barnato and Cecil Rhodes are long gone � but nonetheless our rock sits in esteemed company.
Thanks

[Jennywren200]

The only bit of information that I know that may help. William Wallace was executed at Elms near Smithfield.

[piggling]

Barney Barnato & Cecil Rhodes companies founded de Beers

[kempie]

http://en.wikipedia.org/wiki/Hatton_Garden

[HaizeyDays]

Christopher Hatton was at Ely Place, and Ely Place is off Charterhouse Street which is mentioned in the fourth clue.

I'm assuming all four clues are streets around the diamond or something. Puzzled.

Probably way off the mark though!

KHT.