Luxury skin products really have to perform to justify the splurge, but there’s one particular anti-ageing serum that 100% lives up to the hype, according to OK!’s beauty testers.The product in question is Rodial Pink Diamond Instant Lifting Serum, and it’s won some incredible reviews for its brightening and tightening effects. Made with actual diamond powder (!), Rodial’s serum is seriously high-end stuff and it has a posh price tag to match.The official RRP is £125 a bottle, although with tester comments about it knocking off a decade, you’d be tempted to save up that amount! The good news, though, is that you don’t have to.