A Historic Icon

The intriguing history of The Napoleon Diamond Necklace @ http://www.smithsonianmag.com/science-nature/diamond3.html?c=y&page=2 involves both royals and con artists + analysts have identified a high proportion of the larger diamonds as rare type IIa + most of the smaller stones as type IaAB via infrared spectrophotometric analysis + luminescence reactions + it is one of the most spectacular jewelry pieces of its period.