A little over six months ago, De Beers Group announced the DiamondProof “diamond verification instrument” at a jewelry trade show in Las Vegas. The idea was that this device could sit inside a retail jewelry location and immediately distinguish between a natural diamond versus a lab-grown diamond. The official announcement for the device included this telling line: “with research showing that almost half of consumers are unaware that every LGD can be readily detected, the device … help[s] underp...