"I only discovered CND Shellac Sassy Sapphire ($15) last year when the Crystal Alchemy Collection launched but I can tell you it will be a winter favourite for years to come. I typically don't like shimmer polish shades but this one is different. The deep midnight blue hue is only slightly shimmery in normal daylight but as soon as the sun rays hit it, it turns into the most beautiful glistening blue stone. I particularly love this in its Shellac formula as the shine is next level." — Tori Crowther, associate editor, UK