(28-09-2016, 10:15 AM)MarcoP wrote: You are not allowed to view links. Register or Login to view.... [deleted for brevity]
I think the large stone at the center could be labelled "La pierre de lazur" and the smaller one above it "azeur".
Terms like that were usually applied to Lapis Lazuli (and sometimes to Sodalite). I'm not sure why there are two with almost the same name, but it's possible they used different terms for the same stone, based on the proportions of minerals/colors. In English, we call the red gemstone "ruby" but if the same basic stone is more pink, it's often called "pink sapphire". Perhaps Lapis was distinguished the same way, with different names for different compositions.
Lapis can be quite variable from a pale whitish blue to a deep, bright azure. Sometimes it has silvery-gold speckles. Bright blue is highly prized. Lapis with a high proportion of Sodalite tends to be more brittle and breaks apart more easily.
If it's Lapis, it has been used since ancient times for dye, medicine, powder (makeup), and sacrificial tributes.