The recent Knight Frank Luxury Investment Index highlights the growing appeal of precious stones, diamonds and coloured ...

cuts, and certifications. Gemologists grade gemstones based on the Four Cs - colour, clarity, cut, and carat (weight). With colours, while most diamonds are colourless, other gemstones are not.

“It was perfect,” she said. Jean-Noel Soni founded Top Notch in 2009, focusing his one-man business on distinctive cuts for colored gemstones. He didn’t want to produce familiar shapes such ...