Thanks Wandoo for your pertinent comments
I'm not very concern about gems, as you said; 
- turquoises, are very easy to get, and very small 
 
- coral, I've been diving for years in Red Sea, and I have a good knowledge about coral, 
the type present on the dagger, it's call "old coral" 
nothing to see with the "China junk" what is just white coral colored artificially  
 
in Egypt I'm a lucky man, I have a very good gems and stones dealer 
 
my concern, will be to find a good jeweller to made a copy for the "cradle silver" to receive the coral missing on the hilt  
 
very good jeweller, to make new, something with a look for ancien  
 
à +
Dom