Buying a loose gemstone gives you independence, you get the freedom to make your own choice, your own jewelry design.
4.00 carat oval-cut blue sapphire, heat-treated, measuring 9.52 × 8.45 × 6.42 mm, from Sri Lanka (Ceylon). At exactly 4 carats, this is a genuinely significant weight specification for blue sapphire — a size with commanding visual presence in any setting. Accompanied by GIA Report #5232835332, a Sapphire Origin Report confirming weight, dimensions, color, transparency, treatment, and geographic origin (Sri Lanka).
Expert Opinion
Ahmed Shareek's Assessment
"At exactly 4.00 carats with a GIA-confirmed Ceylon origin, this is a genuinely commanding size for blue sapphire — the royal blue saturation and mixed brilliant cut give it real depth of color and life, and the documentation removes any guesswork about what you're buying."
Rarity Analysis
Blue is the most widely produced sapphire color on the market, so rarity here comes from the specific combination of qualities in this stone rather than the color category alone.
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Color: Royal Blue with intense saturation is the most sought-after tone/saturation combination for blue sapphire — much of the commercial supply runs noticeably lighter or grayer.
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Size: The vast majority of blue sapphire on the market is cut under 1 carat; a clean, well-proportioned stone at 4.00 carats becomes progressively harder to source as weight increases.
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Treatment: Heat treatment is the standard, fully disclosed enhancement applied to the great majority of fine blue sapphire in the trade — permanent, does not affect durability, and disclosed here exactly as documented on the GIA report, with nothing hidden.
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Cut: The mixed brilliant style — a modified brilliant crown for sparkle paired with a step-cut pavilion for color depth — takes more cutting skill and rough yield loss than a simple standard cut, and is less common on commercial-grade material.
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Documentation: The GIA Sapphire Origin Report confirms Sri Lanka (Ceylon) origin — a lab-verified origin call that isn't available for most stones sold on the open market.
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Combined effect: No single factor here is exceedingly rare on its own — it's the combination of commanding size, saturated Royal Blue color, a skillfully executed cut, and GIA-confirmed Ceylon origin in one stone that makes it difficult to replace at this price point.
Buying Guidance
A few practical points to weigh before purchasing this specific stone:
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Confirm the GIA report details in hand. Check that the report number, weight, dimensions, color, and stated heat treatment on GIA Report #5232835332 match the physical stone before finalizing your purchase.
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Evaluate light performance for an oval brilliant. Oval cuts can show a dark "bowtie" effect or windowing near the center facets — view the stone in hand or on video across a few lighting angles to confirm even brightness across the face-up view.
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Plan the setting around the stone's proportions. At 9.52 × 8.45 mm with pointed ends, an oval benefits from prongs (or a protective bezel/basket) positioned to guard the tips and girdle from chipping in daily wear.
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Understand the heated-vs-unheated tradeoff honestly. Heat treatment is a legitimate, widely accepted industry practice, not a defect — it typically makes fine color available at a more accessible price than a comparable unheated stone, and this store discloses it plainly rather than obscuring it.
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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 # |
CG8363 |
| Carat Weight |
4.00 ct |
| Species / Variety |
Natural Blue Sapphire (Corundum) |
| Shape / Cut |
Oval, Mixed Brilliant (modified brilliant crown, step-cut pavilion) |
| Dimensions |
9.52 × 8.45 × 6.42 mm |
| Color / Intensity |
Blue (Royal Blue), Intense saturation |
| Phenomenon |
None |
| Treatment |
Heat treated (permanent, industry-standard, fully disclosed) |
| Origin |
Sri Lanka (Ceylon) — GIA confirmed |
| Clarity |
Very Very Slightly Included (eye-clean) |
| Transparency |
Transparent |
| Hardness |
9 (Mohs) |
| Certification |
GIA Report #5232835332 |
Features
- SKU: CG8363
- Carat Weight: 4.00 carats
- Variety: Blue Sapphire
- Shape: Oval
- Cutting Style: Mixed Brilliant (modified brilliant crown, step cut pavilion)
- Dimensions: 9.52 × 8.45 × 6.42 mm
- Gem Type: Natural Blue Sapphire
- Origin: Sri Lanka (Ceylon) — GIA confirmed (GIA Sapphire Origin Report)
- Treatment: Heat treated
- Color: Blue (Royal Blue)
- Transparency: Transparent
- Clarity: Very Very Slightly Included (eye-clean)
- Certification: GIA Report #5232835332
- Hardness: 9 on the Mohs scale
Care
- Clean with lukewarm water and mild soap using a soft brush
- Store separately to avoid surface contact
- Remove before heavy physical activity
- Avoid ultrasonic or steam cleaners
One of a Kind
This is a single natural gemstone, not a manufactured or lab-created replica — no two sapphires form with identical color, inclusions, and internal character. Once this stone sells, it's gone; there is no duplicate. What you see documented on the GIA report is the exact, individual stone you receive.
What's included with this Blue Sapphire
- GIA Report #5232835332
- Gemstone packed in a gem sleeve
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