Thank you all for your replies !
It is not made of jadeite jade ( the number one )
But yes good nephritic jade ( certiified as I wrote )
I found this ottoman dagger '' kard'' with a similar jade handle ,
Interesting wootz blade who links with the comment of Battara about Indian or Turkish crystalline wootz .( still thank you )
For the grit, I started with 400 ( they where a lot of scratches /stains , then 600, 800, 1000, 1200 and 1500,
the finest grain I have.
Then etching , ( and sure baking soda neutralisation ! ) results I think would have been better with Nital but I finished my small bottle time ago and can get it again easily 😑
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