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A natural 4.25 carat Oval Cat's Eye Chrysoberyl cabochon, completely untreated and now GIA certified (Report #6247017765). Cat's eye chrysoberyl is the most prized chatoyant gemstone — a phenomenon stone that displays a sharp, single band of light (the cat's eye) that glides across the dome of the cabochon as the stone is rotated. At 4.25 carats, this is a collector-grade specimen: cat's eye chrysoberyl above 3 carats with a sharp, well-defined eye represents the premium tier of this phenomenon category. Chrysoberyl ranks 8.5 on the Mohs scale — harder than most gem species outside the corundum family.
Expert Opinion
Ahmed Shareek's Assessment
"What stands out on this 4.25 ct chrysoberyl is the sharpness of the eye against a silver band — that crispness, combined with a completely untreated, GIA-confirmed origin story, is what puts a cat's eye in the collector-grade tier rather than the commercial one."
Rarity Analysis
A handful of factors combine to make this specific chrysoberyl an uncommon find, even within the cat's eye category:
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Color: A greenish yellow body color of medium saturation, paired with a sharp silver eye — a distinct combination noted in the stone's own color record.
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Size: At 4.25 carats, this stone sits above the 3-carat threshold the listing itself identifies as the point where sharp-eyed cat's eye chrysoberyl becomes collector-grade material.
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Treatment: Completely untreated ("No Enhancement"), which is the natural state for the finest cat's eye chrysoberyl and is not something every stone on the market can claim.
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Phenomenon: Displays true chatoyancy — a single, sharp band of light that glides across the dome as the stone is rotated, rather than a diffuse or poorly-centered eye.
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Documentation: Backed by a GIA Cat's Eye Chrysoberyl Report (#6247017765) confirming species and phenomenon; the Sri Lanka (Ceylon) origin is the store's own assessment and is not covered by that report.
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Combined effect: A sharp-eyed, untreated, GIA-documented cat's eye chrysoberyl over 4 carats is genuinely uncommon — most material seen on the market is smaller, treated, or shows a softer, less centered eye.
Buying Guidance
A few practical points to weigh before purchasing this specific stone:
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View it under a single direct light source, such as a flashlight or spotlight, to see the sharp band glide across the dome — diffuse or multi-directional lighting will mute the effect.
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Plan the setting around the cabochon's dome. At 9.63 x 7.55 x 5.41 mm, this is a moderately domed oval cabochon, so a bezel or protective prong setting that leaves the dome unobstructed will show the eye best.
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Ask any seller for the GIA report number when comparison-shopping cat's eye chrysoberyl, and confirm whether the stone is disclosed as untreated — not all cat's eye material sold online carries that disclosure.
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Availability is limited to this single piece. As a natural cabochon, this stone is one of a kind by nature, and the combination of size, sharp eye, and untreated status described above is not something that can be reordered.
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Use the Try Before You Buy option if you would like to see the stone in hand before finalizing the purchase.
Learn More About This Gemstone
Gemstone Data — At a Glance
| Item # |
CG8442 |
| Carat Weight |
4.25 ct |
| Species / Variety |
Chrysoberyl, Cat's-Eye variety |
| Shape / Cut |
Oval Cabochon |
| Dimensions |
9.63 x 7.55 x 5.41 mm |
| Color / Intensity |
Greenish Yellow, Medium saturation |
| Phenomenon |
Chatoyancy (Cat's-Eye), sharp silver eye |
| Treatment |
Untreated (No Enhancement) |
| Origin |
Sri Lanka (Ceylon) — store assessment, not covered by GIA report |
| Clarity |
Eye Clean |
| Transparency |
Transparent |
| Hardness |
8.5 (Mohs) |
| Certification |
GIA Report #6247017765 |
Why the Cat's Eye Effect Happens
Cat's eye chrysoberyl's chatoyancy phenomenon is caused by microscopic parallel needle-like inclusions aligned within the crystal — light reflects off these needles as a single sharp band. The finest examples show a strong, well-defined eye and a "milk and honey" effect: when illuminated from one side, half the dome appears lighter and half darker, divided by the moving band of the eye.
Features of this Cat's Eye Chrysoberyl
- SKU: CG8442
- Carat Weight: 4.25 carats
- Dimensions: 9.63 × 7.55 × 5.41 mm
- Gem Type: Natural Chrysoberyl, Cat's-Eye variety
- Cut: Oval Cabochon
- Origin: Sri Lanka (Ceylon) — store assessment, not covered by this GIA report
- Treatment: Untreated
- Color: Greenish Yellow
- Phenomenon: Displaying Chatoyancy — a sharp band of light moving across the dome
- Transparency: Transparent
- Clarity: Eye Clean
- Certification: GIA Cat's Eye Chrysoberyl Report #6247017765
- Hardness: 8.5 on the Mohs scale
This 4.25 ct Oval Cat's Eye Chrysoberyl has been hand-selected as a collector-grade specimen — sharpness of the eye, quality of the chatoyancy effect, and size all meet the criteria for the premium tier of this phenomenon category.
Care
- Clean with lukewarm water and mild soap using a soft brush
- Store separately to avoid surface contact
- Avoid ultrasonic or steam cleaners, which can affect the cabochon's polish and chatoyant effect
What's included
- GIA Cat's Eye Chrysoberyl Report #6247017765
- Gemstone packed in a gem sleeve
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