Convert stones to carats for jewelry appraisal, gemstone grading, and weight measurement. Accurate calculator with conversion factor 1 stone = 6,350.29 carats.
1 stone equals 31751.474856007062 carat
Formula: kg = st × 6.35029
The stone and carat represent fundamentally different weight measurement systems. One stone equals approximately 6,350.29 carats—a conversion crucial for gemologists, jewelers, and anyone dealing with precious stones or traditional body weight measurements. Understanding this conversion prevents costly mistakes in jewelry valuation and international gem trading.
In the gemstone industry, a single carat difference can mean thousands of dollars in value. The stone, primarily used for body weight in Commonwealth countries, differs entirely from the carat used in jewelry. Misunderstanding this conversion has led to pricing errors exceeding 100% in gem transactions. Accuracy is essential for insurance valuations, international trade, and professional gemology work.
Gemologists and jewelers frequently encounter stones measured in different units. When appraising antique jewelry or converting between international markets, precise conversion between stones and carats ensures accurate valuations. A single carat error on a high-quality diamond can represent thousands of dollars in valuation discrepancy, making precise conversion critical for professional credibility and client trust.
Gem traders operating across Commonwealth and metric-system countries must convert between stones and carats daily. Gemological laboratories in different regions use different units; the Gemological Institute of America uses carats, while some British dealers reference stones. Incorrect conversion leads to pricing errors, trade disputes, and regulatory compliance issues in international commerce.
| stones | carats |
|---|---|
| 1 st | 31751.474856 ct |
| 2 st | 63502.949712 ct |
| 5 st | 158757.37428 ct |
| 10 st | 317514.74856 ct |
| 20 st | 635029.49712 ct |
Formula: ct = st × conversion factor
The stone is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
The carat is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
This stone to carat converter uses high-precision conversion factors to ensure accurate results for professional and academic use.
Our calculator provides results with up to 10 decimal places for maximum accuracy.
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.
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