Diamond

Carat weight is one of the most visible and impactful value drivers in diamonds, with price per carat increasing sharply at key weight thresholds (e.g., 1.00, 1.50, 2.00 carats and above) for stones with desirable color, clarity and cut. For large, high-quality diamonds, availability is limited and pricing becomes highly nonlinear.

For white diamonds, the less color the better: stones in the D–F color range command the highest prices, followed by near-colorless G–J grades. Fancy colored diamonds are valued differently, with intense saturation and pure hues (such as vivid pink or blue) commanding extraordinary premiums.

Clarity measures the presence of internal inclusions and surface blemishes. High-clarity stones (FL, IF, VVS) are rarer and more valuable, especially in larger sizes; however, eye-clean VS and SI stones are common in the jewelry market and can represent strong value. Heavily included stones (I1–I3) are less desirable, particularly when inclusions affect durability or brilliance.

Cut is critical to diamond performance and often has more impact on apparent beauty than small differences in color or clarity. Well-cut diamonds with excellent proportions, symmetry and polish exhibit strong brightness, fire and scintillation, while poorly cut stones can look dull even if they have high color and clarity grades.

Diamonds are mined from kimberlite and lamproite pipes and alluvial deposits in countries including Russia, Botswana, Canada, Australia and others. Production is dominated by a few large mining companies, with additional output from smaller operations and artisanal miners. Lab-grown diamonds also contribute to overall diamond supply in the jewelry market.

Demand for diamonds is driven by their entrenched role in engagement rings and fine jewelry, as well as their perceived status as luxury and investment items. Key markets include the United States, China, India, the Middle East and Europe, with shifting cultural preferences influencing styles and qualities in demand.

Natural diamond demand has shown cyclicality tied to macroeconomic conditions, while the emergence of lab-grown diamonds has introduced new price dynamics in the mid-market. High-end demand for rare large stones and fancy colors has remained resilient, with notable records at auction.