Not all rings being sold as "black titanium" are the same. Many being sold on discount sites like amazon, ebay and low end websites are titanium rings that have been I.P. plated. This means the plating will very easily scratch off. We have tested these rings ourselves and they do not hold up to normal wear.
We've been selling authentic black titanium rings since 2002 and have had many manufacturers send us ring samples. None of the rings we tested using a metallurgical laboratory were actually black titanium. Many were IP plated and some were zirconium - not even titanium. So insist on an Edward Mirell brand ring as they use only the Black-Ti material developed by Spectore Corporation.
Learn more about black titanium