Convert carats to stones for diamond grading, jewelry appraisal, and precious metal transactions. Accurate conversion calculator with industry examples and historical context.
1 carat equals 0.0000314946 stone
Formula: st = ct × 0.0000314946
The carat and stone represent two distinct weight measurement systems used across different industries and regions. One carat equals approximately 0.0001 stone (or 1 stone equals 10,000 carats), making this conversion essential for jewelry professionals, gemologists, and international precious metal traders. Understanding both units prevents costly errors in high-value transactions.
In the jewelry and gemstone industry, weight precision directly impacts valuation. A single carat difference in a diamond can mean thousands of dollars in price variation. While carats dominate the global gemstone market, stones are still used in some traditional markets and for bulk precious metal measurements. Accurate conversion ensures proper pricing, fair trading, and compliance with international gemstone certification standards.
Professional jewelers and gemologists use carats as the primary weight measurement for diamonds, rubies, sapphires, and emeralds. However, when dealing with bulk precious metals or antique jewelry collections, especially in Commonwealth countries, stone measurements may appear in historical documentation or specialized markets. Conversion between these units ensures accurate appraisals across different valuation systems and geographic markets.
Gold, silver, and platinum traders occasionally encounter stone measurements in historical price records, older contracts, or when dealing with traditional bullion markets in Commonwealth nations. Modern precious metal trading predominantly uses grams, troy ounces, and kilograms, but understanding stone conversions helps traders interpret historical market data and communicate with international counterparts familiar with imperial weight systems.
| carats | stones |
|---|---|
| 10 ct | 0.000315 st |
| 50 ct | 0.001575 st |
| 100 ct | 0.003149 st |
| 500 ct | 0.015747 st |
| 1000 ct | 0.031495 st |
Formula: st = ct × conversion factor
The carat is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
The stone is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
This carat to stone 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.
One stone equals exactly 10,000 carats. This means 1 carat = 0.0001 stone. For practical gemstone work, this conversion rarely occurs because the jewelry industry exclusively uses carats. However, if you encounter historical records or bulk precious metal measurements in stone, multiply by 10,000 to convert to carats. For example, 0.5 stone = 5,000 carats, which would be an exceptionally large gemstone (approximately 1 kilogram).
Carats became the international standard for gemstone weight because they're more precise for smaller stones. Diamonds typically range from 0.5 to 5 carats, which are manageable numbers for industry communication. Using stones would require decimal places (0.00005 to 0.0005 stone), creating confusion and calculation errors. Additionally, the Gemological Institute of America and international gemstone certification bodies standardized on carats in the late 1800s, and this dominance persists worldwide.
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