Popular Lab Diamond Carat Sizes and Estimated Demand Distribution

Carat Size Demand Distribution
0.01 - 0.90 Similar price per carat
0.90 Magic number
1.00 Magic number
1.50 Magic number
2.00 Magic number
3.00 Magic number
4.00 Magic number
5.00 Magic number

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These “magic numbers” represent critical points where there are significant price jumps. Lab-grown diamonds below 0.90 carats typically have a similar price per carat. The information is based on industry trends and pricing data.

Please note that this is an approximate distribution based on general market trends. The actual demand may vary depending on factors such as regional preferences, market fluctuations, and consumer behavior.

The most popular carat size range is 1.00-1.49 carats, accounting for about 35% of the total demand. This is because the diamonds of the carat size are visually appealing without being ostentatious and strike a balance between price and perceived value. 

Larger carat sizes, such as those above 3 carats, have a smaller market share due to their higher prices and more limited availability.

However, it's important to remember that carat size is just one facet of the "Four Cs" that determine a diamond's value: cut, clarity, color, and carat weight. A well-cut diamond, even at a slightly smaller carat weight, can deliver superior brilliance and fire, often outweighing the allure of a larger stone with less ideal proportions.

Geographic trends also play a role. While a one-carat stone remains popular in the United States, couples in Europe often opt for smaller diamonds, averaging around 0.5 to 0.6 carats. This preference reflects cultural sensibilities and possibly even economic considerations.

Ultimately, the ideal carat size hinges on personal preferences and priorities. Younger couples might gravitate towards the one-to-two carat range, while older couples may prioritize other qualities or prefer a more understated look. Consulting with a reputable jeweler who can guide you through the intricacies of diamond selection and help you find a stone that aligns perfectly with your taste and budget is key to making a well-informed and cherished choice.

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