About Diamond Weights

Diamonds are one of the most sought-after gemstones, and their value is largely influenced by their carat weight. Understanding how diamonds are measured and the history behind these measurements can help you make informed decisions when purchasing diamond jewelry.

What Is Carat Weight?

The term carat refers to the unit of weight used to measure diamonds.

  • 1 carat equals 200 milligrams (or 0.2 grams).
  • In some cases, you may hear diamonds referred to in grains. A four-grain diamond is the same as a one-carat diamond.

Historical Origins of Carat

The word carat originates from the carob tree, which is native to the Mediterranean region. The seeds of the carob tree were historically used as a standard for weighing diamonds because of their uniform weight. A diamond that matched the weight of one carob seed was considered one carat.

In regions where carob trees were not available, such as the Far East, rice grains were used instead. Here, a diamond weighing as much as four grains of rice was considered equivalent to one carat.

When shopping for diamonds, you’ll notice that 1/3-carat diamonds are among the most commonly purchased. These diamonds strike a balance between size, quality, and affordability, making them a popular choice for engagement rings and other fine jewelry.

Understanding CTW (Carat Total Weight)

When buying diamond jewelry, especially pieces with multiple stones, you may encounter the term CTW or Carat Total Weight. Here’s what you need to know:

  • CTW represents the total carat weight of all the diamonds in a piece of jewelry.
  • It does not indicate the weight of each individual diamond.

For example, a ring with a CTW of 1 carat might have multiple small diamonds adding up to 1 carat in total weight. If you’re looking for a centerpiece diamond, ask the jeweler about the carat weight of the largest diamond in the piece to understand its value and size.

Tips for Buying Diamonds

  1. Ask for Specific Details: Always ask for the exact carat weight of the main diamond, not just the total weight of all stones.
  2. Consider Your Budget: While larger diamonds may seem appealing, smaller diamonds with high clarity and cut can often provide better value.
  3. Check Certification: Ensure that the diamond comes with a trusted certification (e.g., GIA, AGS) that verifies its carat weight and other attributes.

Understanding diamond weights and how they influence price and quality will help you make a confident purchase. Whether you’re shopping for an engagement ring or a timeless piece of jewelry, being informed ensures you get the best value for your money.