How to properly change font weight in model?

[adutzu89]

I am having issues setting font weight for a column inside QTableView's model.
I found that I can use QFont for it, but I cannot find a way to set only the font weight, I want the text bolded for some cells.
I tried it like this:

QVariant ModelLIes::data(const QModelIndex &index, int role) const{
    QVariant value = QSqlQueryModel::data(index, role);
    if(index.column() == 5){
        if(role == Qt::FontRole){
            int valStare=QSqlQueryModel::data(index, Qt::DisplayRole).toInt(); // to check which cells to modify in the column
            QFontInfo info(QSqlQueryModel::data(index, Qt::DisplayRole).toString());
            int marime=info.pointSize(); //tried also pixelSize();
            QString fam=info.family();
            if(valStare==1)
                return QFont(fam, marime,QFont::Bold);
        }
    }
    return value;
}

QVariant ModelLIes::data(const QModelIndex &index, int role) const{
    QVariant value = QSqlQueryModel::data(index, role);
    if(index.column() == 5){
        if(role == Qt::FontRole){
            int valStare=QSqlQueryModel::data(index, Qt::DisplayRole).toInt(); // to check which cells to modify in the column
            QFontInfo info(QSqlQueryModel::data(index, Qt::DisplayRole).toString());
            int marime=info.pointSize(); //tried also pixelSize();
            QString fam=info.family();
            if(valStare==1)
                return QFont(fam, marime,QFont::Bold);
        }
    }
    return value;
}

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But the font is different from the rest of my tableview.(Is it setting the font size and family to what I am using on my OS?)

Any suggestions?