This is Barry M's Pure Turquoise. It reminds me of blue smarties, but that's probably more the vibrancy of the colour as this is lighter and well... more turquoise! ;)
This is 2 coats, wearing very well with a top coat, I chip polish like you wouldn't believe and this is it's second full day now and no sign of tip wear (I type a lot!) or chips. Looked really glossy without a top coat, I'm just very impatient and dent my newly painted nails without a quick dry top coat.
This was an Asos buy in the sale for £1.75 (where they have Dusky Mauve in stock for £3 and free delivery!) which presumably means it was an end of line as it's quite a summery colour. I can only find a turquoise on the Barry M site, it has the same number but looks different to me... Confusion!