What is the full range of gemstones available at Crescent Gems?

Our complete catalog spans every sapphire color — blue, pink, yellow, teal, purple, violet, green, orange, peach, white, and padparadscha — plus ruby, tsavorite garnet, and chrysoberyl including cat's eye stones. Every cut, from oval and cushion through fancy shapes, and every price tier from designer-parcel pieces to investment-grade certified stones.

How do I find the right stone in such a large catalog?

Use our color-specific and cut-specific collections to narrow your search, or filter by carat weight, treatment, and price directly on this page. If you're not sure where to start, email crescentgems@gmail.com and we will help you find the right stone for your project.

What makes this 1.31 ct green sapphire unheated, and why is that important?

This green sapphire is unheated, as confirmed by AGCL Report #M260345 — it has not been treated with heat to improve color or clarity. Unheated green sapphire is a meaningfully smaller pool than heated commercial material, since most green corundum on the market is heat-treated.

What are the key features of this 1.31 ct round green sapphire?

This 1.31 ct green sapphire is cut round, measuring 6.36 x 6.33 x 4.34 mm, with very slightly included clarity — a practical center-stone weight for rings, pendants, and signature jewelry pieces.

What does AGCL Report #M260345 confirm about this sapphire?

AGCL Report #M260345 confirms the stone as natural corundum green sapphire, its 1.31 ct weight, round shape, dimensions, and no indication of heating. The report does not address geographic origin; the store lists Madagascar as its own assessment.

Is green sapphire a good emerald alternative?

Yes. Green sapphire is Mohs 9, more durable than emerald, and typically doesn't require oil treatment to improve clarity — giving buyers emerald's color family with sapphire's durability.

How does this green sapphire compare to heated or treated sapphires?

Unheated green sapphires like this one offer a pure, untreated stone with authentic color, unlike heated or treated sapphires, which may have artificially improved color or clarity but less natural value.

1.31 Ct natural unheated green sapphire gemstone with brilliant cut and vivid color

1.31 ct unheated green sapphire video showing green color and brilliance under light

1.31 Ct unheated green sapphire gemstone with excellent clarity and brilliant cut

1.31 Ct natural unheated green sapphire gemstone with brilliant cut and excellent clarity

1.31 Ct natural unheated green sapphire gemstone with excellent clarity and brilliant cut

1.31 ct unheated green sapphire video showing sparkle and clarity

1.31 Ct natural unheated green sapphire gemstone with excellent clarity and brilliance

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CG8375

1.31 ct Natural Unheated Green Sapphire – Round Cut | AGCL Certified | Madagascar

¥188,000 JPY

1カラットあたり： ¥143,511

ルースをお選びいただくことで、石もジュエリーのデザインも、ご自身の思いのままにお決めいただけます。

カットスタイル	ファセットカット
宝石の種類	サファイア
重量（ct）	1.31
処理	無処理
産地	マダガスカル
クラリティ	微小な内包物（当店評価）
カラー	グリーン
カラーの詳細	Green
色の濃さ	ミディアム
シェイプ	ラウンド
サイズ（mm）	6.36 x 6.33 x 4.34
カット	Mixed Brilliant
鑑別書	AGCL - Gem Lab

This 1.31 ct natural green sapphire is cut round and completely unheated, documented on AGCL Report #M260345. Green sapphire is natural corundum colored by iron — the durability of Mohs 9 sapphire in the emerald color family, without emerald's fragility, heavy oiling, or inclusion-compromised clarity.

Expert Opinion

Ahmed Shareek's Assessment

"At 1.31 ct with no indication of heating on AGCL Report #M260345, this green sapphire delivers a genuinely rare combination — a natural-color emerald-family hue in a stone hard and durable enough for daily-wear rings, without emerald's fragility."

Rarity Analysis

Green sapphire is one of the least commonly offered sapphire body colors in the general market compared to blue, pink, or yellow.

Color: Green is an uncommon body color for corundum; most green sapphire supply skews toward smaller, lower-saturation material, making a clean medium-saturation green like this one less frequently encountered.
Size: At 1.31 ct, this stone is above the sub-carat range where most affordable green sapphire is concentrated — larger clean green sapphires become progressively harder to source.
Treatment: The great majority of sapphire on the market is heat-treated; this stone carries a documented "no indication of heating" finding, which is the rarer and more valuable status for any sapphire color.
Clarity: Graded Very Slightly Included — a clean, largely eye-clean grade that is not a given in natural, unheated green sapphire, where heavier inclusions are common.
Documentation: AGCL Report #M260345 independently confirms the unheated treatment status and clarity grade stated here.
Combined effect: An uncommon color, above-average size, documented unheated status, and clean clarity rarely converge in one green sapphire — this combination is what makes the stone difficult to replace once sold.

Buying Guidance

A few practical points to weigh before purchasing this specific stone:

View it in both daylight and warm indoor light. Green sapphire can shift subtly in tone between light sources; see how the stone's specific green reads in the lighting you'll wear it in most.
Plan your setting around the 6.36 x 6.33 x 4.34 mm dimensions. This is a round stone with typical sapphire depth — standard round prong or bezel settings sized to these measurements will work without custom fabrication.
Verify the unheated claim against the AGCL report. When comparison shopping green sapphires, always check that "unheated" is backed by an independent lab report rather than a seller's unverified claim.
Weigh this stone against the limited unheated green supply. As the Rarity Analysis notes, documented unheated green sapphire above 1 carat with clean clarity is genuinely scarce — comparable stones are not always readily available.
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 #	CG8375
Carat Weight	1.31 ct
Species / Variety	Corundum / Green Sapphire
Shape / Cut	Round, Mixed Brilliant
Dimensions	6.36 x 6.33 x 4.34 mm
Color / Intensity	Green, medium saturation
Phenomenon	None
Treatment	Unheated — No Indication of Heating per AGCL Report #M260345
Origin	Madagascar (store's own assessment; not addressed by the AGCL report)
Clarity	Very Slightly Included
Transparency	Transparent
Hardness	9 (Mohs)
Certification	AGCL Report #M260345

Features

SKU: CG8375
Variety: Green Sapphire
Carat Weight: 1.31 carats
Dimensions: 6.36 x 6.33 x 4.34 mm
Shape: Round
Cut Style: Mixed Brilliant
Treatment: Unheated — No Indication of Heating per AGCL Report #M260345
Color: Green
Clarity: Very Slightly Included
Transparency: Transparent
Origin: Madagascar (store's own assessment; not addressed by the AGCL report)
Certification: AGCL Report #M260345
Hardness: 9 on the Mohs scale

One of a Kind

This is a single natural gemstone, not a lab-created or mass-produced stone. No two natural sapphires are identical — the exact stone pictured is the exact stone you receive.

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

What's Included

AGCL report
Gemstone packed in a gem sleeve

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