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The drawGradientRect method uses the following trick to render a gradient: The top two vertices of the quad are in one color, and the bottom two vertices are in another. Then, the shadeModel GL11.GL_SMOOTH is used, so that these colors are interpolated and create a gradient effect. To render a String, the drawString method calls the renderString method, which calls the renderStringAtPos method which ultimately calls the renderGlyph method, which calls the render method of the TexturedGlyph class. In that last render method, the color is set via the function parameters. If you created a custom TexturedGlyph that hat a render method with two colors as input, you could enable the above mentioned shadeModel to render a text with a gradient. It's a bit of work but seems definitely possible. Just have a look at net.minecraft.client.gui.fonts.TexturedGlyph::render and net.minecraftforge.fml.client.config.GuiUtils::drawGradientRect PS: Since I'm currently working with 1.14, the class names (any maybe the function names) differ, but apart from that, everything I said should be applicable.