Which cut was the basis for the full-cut modern brilliant?

• A. The old European cut.
• B. The single cut was the basis for the full-cut modern brilliant.
• C. The table cut formed the foundation of modern brillants.
• D. The rose cut influenced modern brilliance.

Answer: (B)

The main idea here is how the modern round brilliant evolved and which early cut laid the groundwork for its facet pattern. The single-cut established a basic, efficient way to arrange facets around the crown and pavilion to return light. As cutters sought more sparkle, they added facets and refined proportions, building up to the full-cut modern brilliant, which optimizes brilliance and fire with its many facets. While older cuts like the old European cut, the table cut, or the rose cut are important steps in diamond-cut history, they do not form the direct basis for the modern full-cut’s light-performance geometry; that lineage traces back to the single-cut.