Grandidierite
Various · 4 specimens · 9.6ct avg






Grandidierite is known for its striking blue-green color, which can exhibit a unique pleochroism, displaying different hues when viewed from different angles. It is relatively soft, with a hardness of 7.5 on the Mohs scale, and is typically found in cabochon cuts that enhance its color and transparency.
Price History
Quality Tiers
Listings
Specimen Data
Value Drivers
Carat weight has a notable impact on Grandidierite pricing, with larger stones generally commanding higher prices. However, the median price per carat remains low, indicating that size alone does not guarantee significant value.
Color is a critical factor in determining the value of Grandidierite, with the most desirable stones showcasing a vivid blue-green hue. Untreated stones from Madagascar tend to fetch higher prices, particularly those with a more intense color saturation.
Clarity plays a moderate role in pricing, as Grandidierite can tolerate some inclusions, but stones with higher clarity and fewer visible imperfections are generally more sought after and valued.
The cut of Grandidierite affects its overall appearance and value, with well-executed cabochons enhancing the stone's color and brilliance. Poorly cut stones may detract from their visual appeal and market price.
Market Dynamics
Grandidierite is primarily sourced from Madagascar, where its availability is limited. The rarity of high-quality specimens contributes to its appeal among collectors and investors alike.
Demand for Grandidierite is driven by collectors seeking unique gemstones and designers looking for distinctive materials. Its rarity and striking color make it an attractive option for investment and personal collections.
The market for Grandidierite has seen a gradual increase in interest, particularly among gemstone enthusiasts. Recent auction results indicate a growing appreciation for high-quality, untreated stones.
News
Insights
The median price per carat for Grandidierite is $2, reflecting its accessibility in the market.
Mean prices can vary significantly, reaching as high as $21 per carat for exceptional specimens.
Most listings feature untreated stones, which are preferred by collectors for their natural beauty.
The P10-P90 price spread highlights the variability in pricing based on quality and size.
Pleochroism means that some orientations show more blue, others more green; cutters must choose the compromise that yields the most marketable face-up color.
Synthetic grandidierite is not produced for the gem trade, so issues of authenticity typically revolve around misidentification rather than deliberate synthesis.
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