I didn’t expect to find this stone and the official guidance is confusing. What you will find is an irregular parallelogram set into the base of the left-hand pillar before the doors of the town hall in High Street and set within an inscribed ring. Couldn’t see it as in anyways bluish myself. The local museum lies not many yards away, slighly nearer Inverness Castle than the stone (a lovely museum with several examples of Pictish Symbol Stones, alas a little late to go on TMA).