Being an idiot, I managed to drop my shades yesterday on the walk in to Coire nan Lochan, probably nearish to the bottom. They're Oakley Jawbreakers, dark blue frames, pale pink lens. I couldn't find them on the way back down, but on the offchance someone on here did, thought it might be worth a post.
Thank you!
(As to why I was wearing sunnies on a miserable winter day in the hills - I'm a contact lens wearer and the wind protection they afford is great for stopping the lenses drying out and falling out!)