Convert carats to milligrams for diamond grading, jewelry design, and precious metal trading. Accurate calculator with industry-standard conversion factor of 200 mg per carat.
1 carat equals 200 milligram
Formula: mg = ct × 200.000
The carat, used exclusively for measuring gemstones and precious metals, converts to milligrams at a precise ratio: 1 carat equals exactly 200 milligrams. This conversion is fundamental to the jewelry industry, where accuracy directly impacts valuation, pricing, and international trade. Understanding this relationship is essential for gemologists, jewelers, traders, and collectors worldwide.
In the jewelry and gemstone industry, even small measurement errors translate to significant financial consequences. A 0.5-carat diamond might be valued at $2,000-$5,000 depending on quality, making precise conversion critical. Incorrect carat-to-milligram conversions can lead to pricing disputes, legal complications in international transactions, and loss of customer trust. Regulatory bodies and certification organizations require exact conversions for authentication and documentation.
Gemological laboratories and certification bodies like the Gemological Institute of America (GIA) and International Gemological Institute (IGI) use carat measurements as the primary weight unit for diamonds and colored gemstones. Conversion to milligrams is essential for precise documentation, database records, and quality assurance. Each certificate must list weight in carats, but internal laboratory systems often work in milligrams for consistency with other measurement standards.
In gold and precious metal markets, carats measure purity (24-carat gold = pure gold) and weight simultaneously in jewelry contexts. Traders converting between trading standards need accurate milligram equivalents for international transactions. Precious metals exchanges use both systems depending on regional regulations and customer requirements. Consistency in conversion ensures accurate pricing across global markets and prevents arbitrage errors.
| carats | milligrams |
|---|---|
| 1 ct | 200 mg |
| 2 ct | 400 mg |
| 5 ct | 1000 mg |
| 10 ct | 2000 mg |
| 20 ct | 4000 mg |
Formula: mg = ct × conversion factor
The carat is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
The milligram is a widely used unit for measuring weight. It is commonly used in various applications and industries worldwide.
This carat to milligram 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 carat equals exactly 200 milligrams. This precise relationship was established by international agreement in 1913 and is defined by the metric carat standard. Unlike many unit conversions that involve approximations, the carat-to-milligram conversion is exact because the carat was specifically defined in relation to the gram: 1 carat = 1/5 gram = 200 milligrams. This exactness makes it one of the most reliable weight conversions in international commerce.
Carats are preferred in the jewelry industry because they were established centuries before the metric system and remain deeply embedded in gemstone pricing, certification, and consumer expectations. A diamond's value is traditionally quoted per carat, creating an entire pricing structure around this unit. Additionally, carats provide convenient numbers for gemstone weights—a typical engagement ring diamond might be 1.5 carats rather than 300 milligrams, which feels more intuitive to consumers. International gemological standards and the 4 Cs (Carat, Cut, Color, Clarity) framework ensure carats remain the industry standard despite the metric system's prevalence.
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