Amblygonite is a lithium–aluminum phosphate mineral that forms in granite pegmatites. It has good luster but pronounced cleavage and a hardness around 5.5–6, making it fragile in jewelry. Faceted stones are rare and typically pale yellow, greenish, colorless or occasionally blue.
Price History
Value Drivers
Carat weight matters mainly for collectors, as any clean stone above a few carats is uncommon. Larger gems are scarce due to cleavage and the tendency for rough to break during cutting.
Color is important but generally subtle: soft pastel yellows, greens and blues in evenly distributed hues are preferred. Strong, pure colors are rare and can draw significant collector interest.
Because amblygonite is typically included and stressed along cleavage planes, eye-clean stones are scarce. Fractures, clouds and cleavages are tolerated at lower price points but reduce brilliance and durability.
Cutting is technically demanding: the stone's perfect cleavage requires careful orientation and gentle polishing. Well-cut stones with good symmetry and minimal windowing are far less common and are valued by connoisseurs.
Market Dynamics
Amblygonite occurs in several classic pegmatite districts (Brazil, United States, Afghanistan, Namibia and others), but most material is industrial or specimen grade. Facet-quality rough is limited and often sacrificed to cleavage or breakage during extraction and cutting.
Demand is concentrated among mineral and rare-gem collectors rather than mainstream jewelry buyers. Its fragility and soft colors limit large-scale commercial use, but unusual locality stones can be highly sought after.
Recent Trends: niche but stable collector interest, with fine, well-documented stones achieving strong prices through specialist dealers and auctions.
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Insights
Amblygonite is part of a solid-solution series with montebrasite, with varying F/OH ratios influencing properties and sometimes trade naming.
Gem-quality amblygonite has been reported from Brazil (notably Minas Gerais), Afghanistan and a handful of other pegmatite localities.
Because of pronounced cleavage and relatively low hardness, amblygonite is best suited to pendants, earrings or collector pieces rather than rings for daily wear.
In the mineral market, large transparent crystals are often sold as specimens instead of being cut, further limiting the supply of faceted stones.
There is minimal standardized pricing; values vary widely depending on locality, size, color and the preferences of individual collectors or dealers.
Because it is little-known to the general public, amblygonite is rarely imitated, and authenticity concerns center more on correct identification versus other phosphate minerals.
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