The design of jewelry from Kanjanaburi Province's identity aims to: 1) Classify the types, limitations, and information of local identity materials in Kanjanaburi Province. 2) Study the identity of Kanjanaburi Province, both in terms of abstract and concrete. 3) Develop guidelines for designing jewelry using local identity materials that communicate the uniqueness of Kanjanaburi Province. The research team gathered data from both documentary sources and field surveys in the Kanjanaburi Province, leading to an analysis of business-related issues in the gem and jewelry industry in the region. The key summarized points for jewelry design into 3 points include: 1) Utilization of local identity materials, black spinel, in Kanjanaburi Province. 2) The essence of the abstract and concrete of Kanjanaburi Province's identity. 3) Trends suitable for developing jewelry patterns from local identity materials. The important components for creating design guidelines, designing jewelry from local identity materials, and selecting a prototype for production were derived from the expertise of three specialists. These components contribute to the production of prototype jewelry representing the unique identity of Kanjanaburi Province. The research results categorize the types of black spinel into three categories: black spinel, black pyroxene, and magnetite. The information on the identity of Kanjanaburi Province can be divided into four aspects: 1) Natural and Environmental Aspect, 2) Cultural Aspect, 3) Ritual Aspect, and 4) Gem and Jewelry Aspect. These aspects lead to the conclusion of design guidelines for jewelry made from black spinel, representing the identity of Kanjanaburi Province, as evaluated by experts. The designed work is a jewelry set called 'Kanjanigar,' specifically inspired by the Kanjanaburi Province's flower, the Kanjanigar flower. The jewelry set includes various earring designs that can be worn according to different clothing styles and occasions. The materials used in the design are small-sized black spinel plates, along with black pyroxene, using drilling and resin techniques. The researchers have transferred this work to local entrepreneurs in Kanjanaburi Province through practical training sessions, with 22 participants. The pre-training understanding of design was rated at 3.31, while post-training understanding significantly increased to 4.65. This indicates that the provided guidelines can effectively enhance the knowledge and skills of local entrepreneurs in Kanjanaburi Province in designing jewelry from black spinel.