Buying a loose gemstone gives you independence, you get the freedom to make your own choice, your own jewelry design.
A natural 1.66 carat yellow sapphire in a radiant cut, completely unheated and documented on AGCL Report #M2513593. The radiant cut combines the rectangular outline of a step cut with brilliant faceting — producing more light return than an emerald cut while maintaining the modern, architectural silhouette. In an unheated yellow sapphire at 1.66 carats, this format delivers the golden color with maximum sparkle across the face, creating a vivid and lively presentation.
Expert Opinion
Ahmed Shareek's Assessment
"Unheated yellow sapphire with this much golden saturation is already uncommon. Cutting it as a radiant, rather than the standard emerald cut most rectangular sapphires receive, adds real sparkle — the brilliant faceting layered onto that step-cut outline returns far more light to the eye than a pure step cut can."
Rarity Analysis
Unheated yellow sapphire with vivid, loupe-clean color in this size range represents a narrow slice of what's actually offered on the market, and the radiant cut narrows the field further.
-
Color: This is a vivid, medium-light-toned yellow with genuine saturation — most unheated yellow sapphire on the market leans pale, since heat treatment is the standard route to reaching this level of golden color.
-
Size: At 1.66 carats, this stone sits above the sub-1-carat range where most affordable unheated yellow sapphire is concentrated.
-
Treatment: The majority of yellow sapphire sold commercially is heat-treated to intensify or clarify color; a stone with no thermal history is a genuine minority within the category.
-
Cut: Radiant is a far less common cut choice for sapphire than oval, cushion, or round — most cutting decisions favor those shapes for yield and color retention, so a radiant-cut sapphire turns up less often in general inventory, and even less often in yellow.
-
Documentation: AGCL Report #M2513593 independently documents this stone's weight, dimensions, color, and lack of heating — a level of third-party verification that isn't attached to every stone on the market.
-
Combined effect: Vivid unheated color, above-average size, an uncommon cut choice, and independent lab documentation rarely line up on a single stone — together they place this sapphire in a smaller, harder-to-replace category than any one factor alone.
Buying Guidance
A few practical points to weigh before purchasing this specific stone:
-
Judge the light performance in motion: A radiant cut layers brilliant crown faceting onto a step-cut pavilion, so its sparkle pattern reads differently from a pure step cut like an emerald cut — ask for video in a couple of lighting setups to see how it performs before you commit.
-
Confirm the setting protects the corners: The cut corners of this octagonal radiant reduce chipping risk compared to a sharp-cornered rectangle, but check that your chosen setting's prong placement still guards them, especially given the stone's 6.80 × 5.40 × 4.56 mm profile.
-
Verify the unheated claim independently: Ask to see AGCL Report #M2513593 directly rather than relying on the listing description alone — the report documents the treatment status in writing.
-
Weigh availability against the cut: Because radiant-cut sapphire is less common than oval or cushion material, expect fewer directly comparable stones to shop against if you wait — that scarcity is worth factoring into your timeline.
-
Try Before You Buy: Request additional photos or a live video call to see the stone's faceting and golden color in hand before finalizing your purchase.
Learn More About This Gemstone
Gemstone Data — At a Glance
| Item # |
CG8351 |
| Carat Weight |
1.66 ct |
| Species/Variety |
Natural Yellow Sapphire (Corundum) |
| Shape/Cut |
Radiant Cut (Octagonal) |
| Dimensions |
6.80 × 5.40 × 4.56 mm |
| Color/Intensity |
Yellow |
| Phenomenon |
None |
| Treatment |
Unheated |
| Origin |
Sri Lanka (Ceylon) — store's own assessment; not addressed by the AGCL report |
| Clarity |
Loupe Clean |
| Transparency |
Transparent |
| Hardness |
9 (Mohs) |
| Certification |
AGCL Report #M2513593 |
Features
- SKU: CG8351
- Carat Weight: 1.66 Carats
- Variety: Yellow Sapphire
- Dimensions: 6.80 x 5.40 x 4.56 mm
- Shape: Octagonal
- Cut Style: Radiant Cut
- Origin: Sri Lanka (Ceylon)
- Treatment: Unheated
- Color: Yellow
- Clarity: Loupe Clean — eye-clean, no visible inclusions under normal viewing
- Transparency: Transparent
- Hardness: 9 on the Mohs scale
- Certification: AGCL Report #M2513593
One of a Kind
This is a single natural gemstone, not a lab-created or manufactured stone — no two are exactly alike. Once sold, this particular 1.66 ct yellow sapphire will not be available again.
Care
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners and harsh chemicals, and store separately from harder or abrasive materials to prevent scratching.
This 1.66 ct unheated radiant yellow sapphire has been hand-selected for the brightness of its yellow and the quality of its radiant faceting — the combination that makes this an unusual and compelling yellow sapphire. Documented on AGCL Report #M2513593, it carries no thermal history — the golden color is entirely natural, exactly as formed.
Perfect Uses
- Engagement ring center stone in yellow gold
- Jyotish / Vedic astrological use (natural Pukhraj)
- Custom pendant or cocktail ring
- Collectors of unheated yellow sapphires in unusual cuts
- Anniversary gift
Pay $0 today
Trial
Pay
