What makes Ceylon sapphire different from other sapphire?

Ceylon (Sri Lankan) sapphire is mined from alluvial gem gravels that have already been freed from host rock, and the country's mineral chemistry produces the widest color range of any single sapphire source - blue, yellow, pink, purple, green, teal, padparadscha and star sapphire. Ceylon stones are especially prized for a bright, lively light return.

Are Ceylon sapphires heated or unheated?

A meaningful share of the Ceylon sapphires in this collection are unheated - natural color as mined, with no thermal enhancement. Treatment status is stated plainly on every product page alongside any lab documentation.

Do Ceylon sapphires come with certification?

Larger and finer stones in this collection ship with GIA reports, and the issuing lab is noted on every certified listing.

What makes the 1.81 ct Natural Ceylon yellow sapphire unique compared to other yellow sapphires?

The 1.81 ct Natural Ceylon yellow sapphire is unheated (per GIA Report #1242017778), passed GIA's color stability test, and features a Radiant Cut that showcases its vivid golden hue.

What does it mean that this sapphire passed GIA's color stability test?

GIA's color stability test confirms the stone's yellow color will not fade or change with prolonged light exposure, adding an extra layer of confidence for buyers of untreated yellow sapphires.

Is the 1.81 ct Natural Ceylon yellow sapphire suitable for everyday jewelry?

Yes, this sapphire's durability and brilliance make it an excellent choice for everyday jewelry such as rings, pendants, and earrings, providing lasting beauty and resilience.

How should I care for my 1.81 ct Natural Ceylon yellow sapphire to maintain its beauty?

To keep your gemstone looking its best, clean it regularly with a soft cloth and mild soap, and avoid harsh chemicals or extreme temperatures that could damage the sapphire.

Can I use the 1.81 ct Natural Ceylon yellow sapphire in custom jewelry designs?

Absolutely, the vivid color and Radiant Cut of this untreated sapphire make it an excellent centerpiece for custom jewelry projects, whether set in rings, pendants, or heirloom pieces.

1.81 ct Radiant Cut Ceylon yellow sapphire displaying golden hue and excellent clarity

1.81 ct Yellow Ceylon Sapphire, Radiant Cut — Unheated

1.81 ct unheated Radiant Cut yellow Ceylon sapphire, close-up view showing golden hue

GIA Report #1242017778 for 1.81 ct Yellow Sapphire, Radiant Cut, unheated, Sri Lanka (Ceylon) origin

1.81 ct unheated Radiant Cut yellow Ceylon sapphire, showing brilliance and clarity

1.81 ct Radiant Cut Ceylon yellow sapphire with excellent clarity and golden hue

1.81 ct natural untreated vivid yellow Radiant Cut sapphire gemstone with excellent clarity and golden hue

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CG8419

1.81 ct Natural Unheated Yellow Sapphire – Radiant Cut | GIA Certified | Sri Lanka (Ceylon)

¥289,500 JPY

1カラットあたり： ¥159,945

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）	1.81
処理	無処理
産地	スリランカ
クラリティ	ごく微小な内包物（当店評価）
カラー	イエロー
カラーの詳細	Strong yellow
色の濃さ	インテンス
シェイプ	ラディアント
サイズ（mm）	7.53 x 4.92 x 4.90mm
カット	Modified Brilliant
鑑別書	GIA

A 1.81 carat Ceylon yellow sapphire in a Radiant Cut, natural and unheated — the golden hue is produced by trace iron in the crystal without any thermal modification. Ceylon is the historic source of fine unheated yellow sapphires, prized particularly for Jyotish (Vedic astrology) applications where an untreated natural stone is the traditional requirement. This stone also passed GIA's color stability test. Accompanied by GIA Sapphire Origin Report #1242017778.

Expert Opinion

Ahmed Shareek's Assessment

"What stands out on this stone is the combination of a fully unheated GIA report and a passed color stability test — that second detail is not something GIA notes on every sapphire, and it means the vivid yellow you see today is confirmed to hold up under light exposure."

Rarity Analysis

A few factors make this specific stone less common than the average yellow sapphire on the market:

Color: A vivid, strong yellow saturation — the hue most sought after in yellow sapphire, rather than the pale or brownish-yellow tones more commonly seen.
Size: At 1.81 carats, this stone is large enough to read clearly face-up in a ring while remaining well above the sub-1-carat sizes that dominate the unheated yellow sapphire market.
Treatment: Fully unheated, confirmed by GIA — the majority of yellow sapphires sold today are heat-treated to improve or deepen color, making an unheated stone of this saturation the minority.
Clarity: Minor inclusions under 10× and eye-clean — our own assessment, not a GIA grade — which keeps the stone's brilliance unobstructed under the Radiant Cut's faceting.
Documentation: Backed by a GIA Sapphire Origin Report confirming Sri Lanka (Ceylon) origin, unheated status, and a passed color stability test — three separate findings on one report.
Combined effect: An unheated, GIA-documented, eye-clean Ceylon yellow sapphire with a vivid saturation and a passed color stability test is a meaningfully uncommon combination, particularly for buyers who require untreated stones for Jyotish use.

Buying Guidance

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

View it in both daylight and warm indoor lighting. Yellow sapphires can read slightly differently between light sources, though this stone's GIA-confirmed color stability means the hue you see is not going to shift or fade over time.
Plan the setting around its 7.53 × 4.92 × 4.90 mm Radiant Cut outline. The cornered rectangular shape benefits from prongs or a setting style that protects the corners, similar to an emerald or cushion cut.
If comparison-shopping other yellow sapphires, ask specifically for the treatment disclosure on the lab report. Many yellow sapphires marketed as natural are heat-treated; this stone's GIA report states unheated in writing.
Factor in the documentation when comparing price. As outlined in the Rarity Analysis above, unheated Ceylon yellow sapphires with a GIA Origin Report and a passed color stability test are not the norm, which affects availability at this quality level.
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 #	CG8419
Carat Weight	1.81 ct
Species / Variety	Corundum / Yellow Sapphire
Shape / Cut	Radiant Cut (Modified Brilliant)
Dimensions	7.53 x 4.92 x 4.90 mm
Color / Intensity	Vivid yellow (Strong)
Phenomenon	None
Treatment	None — unheated (per GIA Report #1242017778)
Origin	Sri Lanka (Ceylon)
Clarity	Minor inclusions under 10× — our own assessment; GIA colored-stone reports carry no clarity grade
Transparency	Transparent
Hardness	9 (Mohs)
Certification	GIA Report #1242017778

Features

SKU: CG8419
Carat Weight: 1.81 carats
Dimensions: 7.53 × 4.92 × 4.90 mm
Gem Type: Natural Yellow Sapphire
Cut: Radiant Cut (Modified Brilliant)
Origin: Sri Lanka (Ceylon)
Treatment: None — unheated (per GIA Report #1242017778)
Color: Vivid yellow
Clarity: Minor inclusions under 10× — our own assessment, not a GIA grade
Color Stability: Passed GIA's color stability test
Certification: GIA Report #1242017778
Hardness: 9 on the Mohs scale

Care of Ceylon yellow sapphire gemstone

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

GIA Sapphire Origin Report #1242017778
Gemstone packed in a gem sleeve

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