تحويل الحجر إلى قيراط: الأحجار الكريمة والمجوهرات وقياس الوزن

Exactly 6,350.29348 carats equal one stone. This conversion stems from the stone being defined as 14 pounds (6.35029318 kilograms) and the carat being defined as exactly 200 milligrams. For practical purposes, 6,350.29 carats per stone is sufficiently precise for most applications, though professional gemologists use the full factor for valuations.

Carats provide greater precision for small, valuable items. A single carat represents 200 milligrams, allowing gemologists to measure stones with decimal precision (e.g., 1.5 carats = 300 mg). Using stones would be impractical—a typical gemstone would be 0.0001 stones. Historically, the carat was standardized internationally in 1913 specifically because it suited gemstone measurement better than larger units.