Jun 9, 2019
Natural and untreated citrine can be quite rare as a lot of the citrine in the market are treated. A common treatment is to heat some types of amethyst to turn them yellow. The intensity of color can be determined by the temperature. A lower temperature will produce a light yellow, while a higher one will give a golden orange color. Smoky quartz can also turn yellow after heating. Also, natural citrine itself will have a more intense yellow color after mild heating.