Carat is a unit of weight used to measure diamonds and other gemstones. The term "carat" originated from the carob seed, which was historically used as a reference for weighing gemstones due to its uniform size and weight. One carat is precisely equivalent to 200 milligrams (0.2 grams). Carat weight is often abbreviated as "ct."

Carat weight is divided into 100 points, allowing for precise measurement. For example, a diamond weighing 0.75 carats is often referred to as a "75-point diamond."

Carat VS Size

While carat refers to the weight of the diamond, it does not necessarily equate to its size. Many people mistakenly believe that a half-carat diamond is half the size of a one-carat diamond. In truth, a half-carat diamond is half the weight of a one-carat diamond. The size of a diamond is influenced by its cut and shape. Two diamonds of the same carat weight can appear different in size depending on their proportions and depth. 

The length-to-width ratio of a diamond refers to how elongated or compact its shape appears when viewed from above. Different ratios can affect the diamond's perceived size. While there are industry-standard ratios that jewelers often adhere to, the choice of length-to-width ratio is largely a matter of personal preference. Some prefer a more elongated shape for its perceived size, while others may favor a more symmetrical or compact appearance.

Magic Numbers

In the diamond industry, certain carat weights are known as "magic numbers" due to their popularity and significance. Magic numbers hold psychological appeal due to their round, whole-numbered values. A diamond weighing exactly one carat is perceived as more desirable than one weighing 0.95 carats, even though the size difference is nearly imperceptible. 

Magic numbers hold psychological appeal due to their round, whole-numbered values. A diamond weighing exactly one carat is perceived as more desirable than one weighing 0.95 carats, even though the size difference is nearly imperceptible. Similarly, the jump from a 1.99-carat diamond to a 2.00-carat diamond can result in a substantial price increase. To get the best value for your money, consider purchasing a diamond just below these magic numbers. For example, a 0.95-carat diamond will look almost identical to a 1.00-carat diamond but can cost significantly less. 

To get the best value for your money, consider purchasing a diamond just below these magic numbers. For example, a 0.95-carat diamond will look almost identical to a 1.00-carat diamond but can cost significantly less.

Choosing the Right Carat Weight