Description
Peridot occupies a singular place in the gemstone world as one of the few minerals that forms in the Earth’s upper mantle rather than the crust, carried to the surface through volcanic activity and, on rare occasion, delivered by meteorites. This 2.48-carat specimen displays the variety’s characteristic lime-to-olive green, a colour born not from trace impurities but from the iron intrinsic to its chemical composition — making it a true idiochromatic gem. For the discerning collector, a well-proportioned peridot of this weight offers both historical resonance and a vivid warmth that performs beautifully under candlelight and natural illumination alike.
Frequently Asked Questions
What gives peridot its green colour, and how does saturation affect value?
Unlike most gemstones whose colour arises from trace elements, peridot is idiochromatic — its green hue is produced by iron that is fundamental to its own chemical structure, forsterite (Mg,Fe)₂SiO₄. The precise ratio of iron content governs whether the stone appears a bright yellowish-green or a deeper, more olivaceous tone; collectors generally prize a pure, medium-toned green with minimal yellow or brown modifiers. At 2.48 carats, a stone of good saturation will display a lively, confident colour face-up without the muddiness that can affect larger or poorly cut specimens.
Does peridot exhibit any optical phenomena, and what are its key optical properties?
Peridot does not display phenomena such as asterism or chatoyancy, but it possesses a distinctive double refraction (birefringence) that is among the strongest of any faceted gemstone, which can cause a subtle visual doubling of the back facets when viewed through the table. This property, combined with a refractive index of approximately 1.654–1.690, gives well-cut peridot a lively, slightly velvety depth that sets it apart from superficially similar green stones. Collectors familiar with the material learn to appreciate this internal character as a marker of authenticity and natural origin.
How should peridot be cared for, and what are its durability considerations?
Peridot has a Mohs hardness of 6.5–7, meaning it is moderately durable but more susceptible to surface abrasion than sapphire or spinel, and should be stored separately from harder gemstones to avoid scratching. The stone is also sensitive to rapid temperature changes and prolonged exposure to acids, including perspiration over time, so it is best cleaned gently with lukewarm water and a soft cloth rather than ultrasonic or steam cleaners. Mounting it in a protective setting with raised prongs or a bezel can significantly extend its wearable life.
Is peridot considered a worthwhile addition to a serious gem collection, and does certification add value?
Peridot from exceptional origins — particularly the high-iron, deeply saturated material from Pakistan’s Suppat Valley in the Himalayas — commands meaningful premiums and is increasingly sought by collectors who recognise its rarity relative to commercial-grade stones. A laboratory report from a respected institution such as GIA, Gübelin, or SSEF confirming origin and confirming the absence of treatments provides important provenance documentation that underpins resale confidence. At 2.48 carats, a well-saturated, clean stone with credible certification represents a considered acquisition in a colour category that remains undervalued relative to its geological rarity.
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