A diamond’s weight is measured in carats, a unit equivalent to 200 milligrams. Therefore, a 0.15-carat diamond weighs 0.03 grams or 30 milligrams. This standardized unit ensures consistent measurement across the diamond industry, facilitating clear communication and comparison of different stones.
Understanding this weight measurement is crucial for consumers and professionals alike. It allows for accurate pricing and comparison, as weight is a significant factor influencing a diamond’s value. Historically, the carat weight system evolved from the carob seed, which was known for its relatively uniform weight and used as a counterbalance in early gem trading. This historical context underscores the enduring importance of standardized weight measurement in the gem trade.