Topaz of any type is a good jewelry stone. With its relatively high refractive index and hardness of 8, with no special sensitivity to chemicals it can be used, with appropriate care, in any jewelry application. All that is necessary is to protect the gem from hard knocks and to avoid steamers and ultrasonics in cleaning.
The subject of enhancement in the topaz family is a complicated one, but for the most part, except for colorless stones, it is prudent to assume that some form of heat and/or irradiation has been used on stones prior to cutting. The color of precious topaz is generally heat and light stable.