This article presents two independent studies of Finnish teachers' conceptions of giftedness and considers whether it is a malleable or fixed quality. The first qualitative study examined elementary school teachers' (N = 212) conceptions via inductive-oriented content analysis, whereas the second study measured teachers' (elementary n = 184, secondary n = 279) conceptions with a quantitative approach. According to teachers' open-ended definitions, giftedness was seen to be multidimensional and a characteristic that differentiates the person from others. Giftedness was also described via cognitive, creative, and motivational features of the gifted. Furthermore, the two independent studies suggest quite different views on how Finnish teachers understand the developmental nature of giftedness: The first indicates that the developmental nature of giftedness was not frequently mentioned, whereas the second found that a malleable view of giftedness (i.e., a growth mindset) was dominant. Thus, this article highlights a need for in-depth and mixed-methods research designs to study how teachers see the developing nature of giftedness.