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The product design analysis of black spinel jewelry of Anantapol Ploykan’s Black Spinel Cutting Center revealed there major findings. First, regarding the jewelry design, the geometric forms, the natural forms, and the abstraction forms were used respectively. Second, regarding the jewelry pattern, the natural forms, the geometric forms, and the abstraction forms were used respectively. Third, regarding the gem shape, the ellipsis shape was found the most. Concerning the consumers’ preference and buying decision of black spinel jewelry of Anantapol Ploykan’s Black Spinel Cutting Center, it was found that they mostly prefer and are most likely to purchase the black spinel rings with the geometric forms, the pendants and necklaces with abstraction design and pattern, the bracelets and bangles with the geometric design and natural pattern, and the earrings with the natural design and pattern.
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