Looked through the archives and found plenty about Liogier, but nothing addressed this particular question:
Does anybody know what Liogier's "proprietary" Sapphire coating is?
The color and stated hardness of HV 2800 are both exact matches to Titanium Aluminum Nitride, which is used on some higher-end drill bits (note that that's a 15-bit set for $225. Did I mention that it's expensive?). The wording of Liogier's corrosion resistance claim is also consistent with TiAlN. Can anybody confirm?