How to highlight my Master's thesis grade in CV
Great mark and well done! However, this is hard to mention without looking a little ostentatious as you say, so it's probably better to just include your overall degree result. Presumably if you got such a high mark for your thesis, you would have attained a distinction for your degree. If you did not do so and attained a pass or merit, and you include your thesis mark, this could raise questions as to why you ended up getting a lesser mark in your degree. If you did get a distinction overall - then congratulations - and that mark would speak for itself. If you really do want to include it, do so in the most minimalist way, such as Thesis - Thesis Title (9/10). Supervisor - Dr XX XXXX.