Hello Alan, 
Regarding the top part of the scabbard, Neka calls it sampir/ warangka (page 52) and Djelenga calls it angkup (page 288). 
I have several uwers from Bali/ Lombok with pink stones (see pics) but I am not sure about the materials. 
The "atasan" of my ex-kris was not made by the Dutch seller, it has some age and I shipped the whole kris to Solo for adjusting and treating the blade, polishing the atasan, and fitting the pendok. 
Regards
		 
		
		
		
			
		
		
		
		
		
		
		
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