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Jewelry Tips: Unlike precious metals, titanium uses a complex industrial grading system; three of these grades are used in jewelry: “Commercially pure” titanium, called CP or ASTM Grade 2 (in jewelry terms, 990 fine) is the most hypo-allergenic and could be called medical grade. Ti-6/4, also called ASTM Grade 5 or aircraft grade (900 titanium 60 aluminum 40 vanadium), and Ti-6/6/2 (860 titanium 60 aluminum 60 vanadium 20 tin) are the extremely hard alloys. These designations are not always included in descriptions.
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