most of their sales do not include loose diamonds or gemtones, only the settings. They do give a pricescope discount but I am not positive if it applies to loose stones. Use the advice above and tell them you found them on pricescope.
The last couple of time I've purchased a loose diamond from JA they've applied an "advantage discount" to the loose diamond, typically apx 3% of the diamond price -- each time, during a Live Chat, when I'd ask that the diamond be reserved for me while an Aset was ordered, I'd also ask that the JA advantage discount be applied to the order.
Does anyone know if they do any deals for the 4th of july? I am buying both a setting and diamond from jamesallen and was wondering if it was worth waiting to buy