Gem enhancement through color-inducing or color-improving treatments is a well-established practice that significantly increases the commercial value of otherwise low-quality minerals for use in the jewelry industry. Among these techniques, heat treatment is one of the oldest and most widely applied, commonly used to transform amethyst into citrine and to enhance or induce coloration in corundum. In southern Brazil, a region recognized for its amethyst and agate production, heat treatment is routinely employed on amethyst crystals to produce commercially desirable citrine. Colorless quartz (also known as rock crystal or hyaline quartz), frequently found in association with amethyst geodes, has low intrinsic market value. Additionally, although less widely known, occurrences of corundum, exclusively in the state of Santa Catarina, present material of limited gemological quality. Recent research, however, has demonstrated that both quartz and corundum from the region respond positively to controlled heat treatment, enabling the development of attractive coloration and significant visual improvement. Once treated and properly cut, these gemstones exhibit characteristics consistent with market standards for use in jewelry. These findings highlight the potential of applying gemstone enhancement techniques to underutilized mineral resources, promoting value addition, optimizing resource use, and fostering regional economic development. Furthermore, the integration of such practices contributes to strengthening the Local Productive Arrangements (LPAs) of Gems and Jewelry in southern Brazil, reinforcing sustainability and competitiveness within the sector.