Tourmaline

Carat weight significantly impacts value for rarer, highly saturated colors—such as fine rubellite, indicolite and Paraíba-type stones. Small, commercial-quality tourmalines are common, but larger gems over 5–10 carats in top color and clarity are scarce and can command high prices.

Color is the primary value factor and varies by variety. Vivid, pure hues with strong saturation are most desirable: rich reds, intense greens, deep blues and neon copper-bearing blues/greens lead the market. Stones that are too dark, overly brownish, grayish or pale trade at lower values. Bicolor and parti-color stones are evaluated on the attractiveness and balance of their color zoning.

Tourmaline commonly contains inclusions, especially in rubellite and some greens. Eye-clean stones with good transparency are preferred, particularly in larger sizes. Moderate inclusions may be acceptable in stones with exceptional color, but heavy cloudiness or fractures reduce both beauty and durability.

Cut quality is important to manage pleochroism, color zoning and depth of color. Long emerald and oval cuts are common, aligned along the crystal's c-axis to optimize color. Well-cut tourmalines show lively brilliance and even color, while poor cutting can leave them overly dark or windowed.

Tourmaline is mined in many countries, including Brazil, Mozambique, Nigeria, Afghanistan, Pakistan, Madagascar and the United States. Production encompasses a wide range of colors and qualities, from abundant commercial material to rare, fine-color stones from specific localities.

Demand is robust and diversified. Mid-range jewelry relies on green, pink and multi-color stones, while collectors and high-end brands compete for rare rubellites, indicolites and Paraíba-type tourmalines.

Recent Trends: strong interest in unique colors and bi- or tri-color stones, with ongoing high demand for copper-bearing Paraíba-type material.