The formula of Vivid Violet was very nice, but Covered In Diamonds is VERY thick, so you really only want to do one coat. Luckily it has a lot of flakes, so you get a good coverage in just one application. I can't remember now how long it lasted without chipping, I think it was the average 2 days or so, but in the end I kept it on my nails for ages because it was so pretty.
No7 polishes cost £7 from Boots and you get 10 ml. Color Club isn't available in the UK (other than TKMaxx I think), but on eBay you can find it for around $3 (£1.80) and you get 15 ml.
See more pictures after the jump!