Buying a loose gemstone gives you independence, you get the freedom to make your own choice, your own jewelry design.
A natural 1.37 carat royal blue Ceylon sapphire in an oval cut, heat treated. Royal blue is the most prized hue position in blue sapphire — a medium-dark, strongly saturated pure blue with no significant gray, green, or violet modifier. It is the color most associated with museum-quality Kashmir and Burmese sapphires, and at the finest end of Ceylon production, the same royal blue character is achievable. The oval cut at 1.37 carats places this stone squarely in the commercial center stone size range for engagement rings and pendants.
Expert Opinion
Ahmed Shareek's Assessment
"The hue on this 1.37 ct oval is what I'd call true royal blue — medium-dark, fully saturated, with no gray or violet creeping in — and Ceylon origin combined with eye-clean clarity at this size is a genuinely strong combination for the price point."
Rarity Analysis
Blue is the most common and most sought-after sapphire color, so blue sapphire overall is far from rare — but within blue sapphire, hue position varies enormously, and only a fraction of production reaches true royal blue.
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Color: Most commercial blue sapphire runs either too light, too dark and inky, or carries a gray or violet secondary hue; a pure, medium-dark royal blue with no modifying color is a minority of blue sapphire production.
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Size: 1.37 ct is above the most commonly traded 0.5–1.0 ct commercial range, placing it in a size bracket where supply of well-colored stones narrows.
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Treatment: Heat treatment is standard and expected for the overwhelming majority of commercial blue sapphire, including this stone — disclosed honestly rather than presented as untreated.
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Clarity: Graded eye-clean, with no inclusions visible under normal viewing — a clean result for a stone of this saturation and size.
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Documentation: FGL certification confirms natural corundum, weight, and treatment status.
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Combined effect: It's the pairing of true royal blue hue, above-1-carat weight, eye-clean clarity, and confirmed Ceylon origin — not any single attribute — that puts this stone ahead of typical commercial blue sapphire at this price tier.
Buying Guidance
A few practical points to weigh before purchasing this specific stone:
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View it under more than one light source. Royal blue sapphire can shift subtly toward navy under warm indoor light, so check it in the lighting you'll wear it in most.
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Consider the setting head size. At 7.42 x 5.52 mm, this oval sits comfortably in a classic four- or six-prong solitaire without needing an oversized setting.
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Ask for the saturation and tone grade when comparison shopping. "Royal blue" is used loosely in the trade, and many stones marketed that way are actually mid-tone or gray-modified blue.
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Weigh availability at this hue and size. Ceylon-origin royal blue sapphire above 1 carat with eye-clean clarity is a narrower slice of the market than lighter or grayer blue stones of the same size, as described in the Rarity Analysis above.
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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 # |
CG1000 |
| Carat Weight |
1.37 ct |
| Species / Variety |
Corundum / Blue Sapphire |
| Shape / Cut |
Oval, Step cut |
| Dimensions |
7.42 x 5.52 x 3.73 mm |
| Color / Intensity |
Royal Blue, dark saturation |
| Phenomenon |
None |
| Treatment |
Heat Treated |
| Origin |
Sri Lanka (Ceylon) |
| Clarity |
Eye Clean |
| Transparency |
Transparent |
| Hardness |
9 (Mohs) |
| Certification |
FGL Report #report number not listed in product data |
Why Choose this 1.37 ct Royal Blue Ceylon Sapphire?
Royal blue is the destination hue for blue sapphire buyers — the color that defines the category in most people's minds. In Ceylon origin at 1.37 carats, this stone offers the royal blue character that drives sapphire demand at a scale that is commercially accessible. Heat treatment is the standard for commercial sapphire and is fully disclosed; the royal blue designation reflects the stone's hue position, not a treatment enhancement.
Key Benefits of this Natural Blue Sapphire
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Royal Blue Hue
The most prized position in blue sapphire — medium-dark, strongly saturated, pure blue with no modifying hue.
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Ceylon Origin
Sri Lanka — the primary active source for fine royal blue sapphire at the commercial level.
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Oval Cut Versatility
The most popular engagement ring shape for Ceylon blue sapphire — broad face-up color and strong presence.
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Center Stone Size
1.37 carats in an oval — sufficient weight for a commanding engagement or pendant center stone.
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Durable for Daily Wear
Corundum at Mohs 9, second only to diamond.
Features
- Carat Weight: 1.37 Carats
- Gem Type: Natural Blue Sapphire
- Cut: Oval
- Origin: Sri Lanka (Ceylon)
- Treatment: Heat Treated
- Color: Royal Blue
- Clarity: Eye-clean — no visible inclusions under normal viewing
- Hardness: 9 on the Mohs scale
This 1.37 ct royal blue Ceylon sapphire has been hand-selected for the purity and depth of its blue — the hue position that defines what a fine blue sapphire is supposed to look like.
Why Customers Love This Gemstone
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Royal Blue Benchmark: The hue most associated with fine sapphire — no modifier, fully saturated.
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Ceylon Quality: The origin that consistently delivers this color at the commercial level.
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Oval Practicality: The most requested shape for blue sapphire engagement stones.
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Trusted Source: Treatment disclosed honestly, color quality hand-selected.
Owning this 1.37 ct royal blue Ceylon sapphire means choosing the hue that defines what blue sapphire is — in the origin and cut that make the most of it.
Perfect Uses for this 1.37 ct Blue Sapphire
- Engagement ring center stone
- Custom pendant solitaire
- Three-stone ring center stone
- September birthstone gift
- Anniversary gift at the fine jewelry level
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