Hello,
Thank you Kubur and Marius for your reply,
Yes as I wrote in the first post, the blade is a decorated simple sheet of steel contrasting ( for me ) with all the work for the scabbard.
Perhaps ( maybe certainly ), these semi precious stones and coral were common and massively produced in the region ( Trabzon ??) maybe cheap stuff so craftmen covered all kind of stuff for a low-reasonnable price.
I will add that it was fashionable at that time! ( For export in Europe too)
( I know, I'm old fashioned
... )
That can explain why we find so many ewer, belt buckles... and muskets, swords with these ornaments, turning them finally just in deco pieces...