turquoise shops london

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Hi
Looking for a xmas gift for my mum. She used to have a turquoise heart pendant but was stolen a few years ago.
The internet wasn't very helpful (shocker!!) so I'm looking for a shop in London that would sell semiprecious stones, in particular turquoise. If you know one near you, please let me know name or location. Thank you!! :)

here?
Failing that I usually buy that sort of thing at markets. Greenwich market has a reasonable selection. and May, one of the shops in the market has a few items.

Bah... Autumn and May There's a heart pendant on page 3 of the turquoise jewellery.

Greenwich market is a good idea! Thanks!