We recently did a buy-out in Colorado of old-stock Faceting Rough and included in the buy-out was a small parcel of a few pieces of London Blue Topaz. This material is probably at least 10 years old. There are a few very very fine pinpoints off towards one side in close proximity to the surface and these should facet out or mask up well with a little planning. This is a practically clean stone shaped for average to above average yield.