How many grams is a metric carat equal to?

A metric carat is precisely equal to 0.200 grams. This unit of measurement is specifically used in the jewelry industry to measure the weight of gemstones and precious stones, including diamonds. The definition of a carat as 0.200 grams has been standardized, ensuring consistency in the measurement of gem weights across the industry. This standardization is crucial for fair trading and pricing of gemstones, as even a slight variation in weight can significantly impact the value of a diamond or other gems.

The other options do not represent the correct weight of a metric carat and might lead to confusion about the value and pricing of gemstones. Understanding the exact measurement of a carat is essential for anyone involved in the diamond trade or purchasing diamonds, as it helps in interpreting their weight, size, and ultimately their worth in the marketplace.