Kyanite

Carat weight matters for fine kyanite, as large, clean, richly colored stones are relatively uncommon. Most crystals are fragmented or included. Gems above 3–4 carats with good color and transparency are prized by collectors and can command significantly higher prices per carat than smaller, included stones.

Color is the most important value factor. The best kyanite displays a vivid, medium to medium-dark sapphire-like blue with high saturation and minimal gray. Blue-green or teal kyanite can also be attractive and collectible. Pale, heavily zoned, or strongly grayish stones are less valuable.

Kyanite is frequently included or fractured, particularly along its cleavage and fibrous structure. Eye-clean or nearly eye-clean stones with good transparency are relatively scarce, especially in larger sizes, and are priced accordingly. Obvious fractures and clouds diminish both beauty and durability.

Cutting kyanite is technically difficult. Cutters must orient stones to maximize color while minimizing the impact of cleavage and variable hardness. Well-cut stones show good brightness and an attractive blue, while poorly cut stones may appear dark, lifeless or overly zoned, and may be prone to chipping. Mixed or step cuts are most common.

Kyanite deposits occur in metamorphic rocks worldwide, with significant gem-quality material from Nepal, India, Brazil, Tanzania and other regions. While industrial kyanite resources are large, gem-quality, transparent blue material is more restricted.

Demand is led by collectors and designers who appreciate its sapphire-like color at a lower price point. Kyanite appears in both artisanal and mid-range jewelry lines, but its cutting difficulties and durability concerns prevent it from achieving the widespread use of more robust blue gems.

Recent Trends: niche but stable collector interest, with fine, well-documented stones achieving strong prices through specialist dealers and auctions.