You could change the dimensions of the gems? (So that they actually look like gems more than elongated circles.)
Here is an idea:
Different colour gems for the ratio of posts that are rated for the person. (E.g. if they got a rating to do with study help maybe give a green gem, a rating to do with mental health a blue one.) This would work by finding out the average ratings they have gotten on different issues. (So that then you can know if their advice is any good on what you need help with.)