Which planes are the most important to a diamond cutter?

Which planes are the most important to a diamond cutter?

• A. The tetrahedral, cubic and octahedral
• B. The cubic, tetrahedral and dodecahedral
• C. The cubic, octahedral and dodecahedral
• D. The cubic, octahedral and the dodecahedral

Answer: (D)

When planning how to shape a diamond, cutters rely on the crystal’s principal forms, which define the main families of planes you can facet along with predictable, strong alignment. The three essential forms for diamond are cubic, octahedral, and dodecahedral. These correspond to the primary sets of planes that govern how the stone can be faceted while maintaining symmetry and structural integrity. The cubic form relates to the familiar cube-like planes, the octahedral form relates to the {111} planes that give steep, brilliant faces, and the dodecahedral form provides additional high-symmetry faces that cutters can use to optimize light performance. Tetrahedral planes aren’t among the main natural surfaces used for standard shaping, so they aren’t considered as important for typical cutting strategies.

When planning how to shape a diamond, cutters rely on the crystal’s principal forms, which define the main families of planes you can facet along with predictable, strong alignment. The three essential forms for diamond are cubic, octahedral, and dodecahedral. These correspond to the primary sets of planes that govern how the stone can be faceted while maintaining symmetry and structural integrity. The cubic form relates to the familiar cube-like planes, the octahedral form relates to the {111} planes that give steep, brilliant faces, and the dodecahedral form provides additional high-symmetry faces that cutters can use to optimize light performance. Tetrahedral planes aren’t among the main natural surfaces used for standard shaping, so they aren’t considered as important for typical cutting strategies.