Search Results for: Grading machines
        
	        
		      
	        
		      
	        
		      
	        
		      
	        
		      
	        
              . – is bought and sold based on a grading system. the grading criteria, like diamonds, are generally determined by on-site experts, such as gemologists, geologists, and buyers/traders with many years of experience. diamonds however, are only one type of stone – diamond. it is much easier to establish
		        
              
                  a quantifiable grading system when dealing with one type of stone. this is the reason why the gemological institute of america (gia) created the system now known as the cs – color, cut, clarity, and carat. this system is generally used for consumer purchases, whereas most wholesale diamond transactions...
		      
		        
		      
		        https://www.marblexinc.com/resources/natural-stone-guide/evaluate-natural-stone/