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Oval|Lab Grown|IGI

1.66ct D SI1 Oval Lab Grown Diamond

ID • D/SI1 • IGI LG520284681

Shape and cutting style on the report: Oval brilliant

Certificate IGI LG520284681

Diamond specifications and retailer prices

From $280 SGD
$219 USD
As of November 1, 2026
Save $1,357 SGD (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $1,637 SGD at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1.66ct lab-grown oval diamond

This 1.66ct lab-grown oval sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG520284681 or 520284681. Listed at 17 retailers as of November 1, 2026, with prices from $280 to $1,637, a $1,357 spread on the same certified stone. Brilliant Earth lists it at $1,637. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.66
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle39.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG520284681
Dimensions9.55 × 6.80 × 4.10 mm
L/W Ratio1.40
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
9.55 mm6.80 mm1.66 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG520284681
Side View
Table 60.5%Crown 36.5°Girdle: MED-STKPavilion 39.4°Culet: NoneDepth 60.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: $1,637 SGD|Low: $280 SGD|High: $1,637 SGD|Avg: $814 SGD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 2, 2026
Retailer 8$280 SGD
Retailer 6$313 SGD
Retailer 5$325 SGD
Retailer 14$347 SGD
Retailer 2$386 SGD
Retailer 16$467 SGD
Retailer 9$645 SGD
Retailer 12$675 SGD
Retailer 15$679 SGD
Retailer 4$747 SGD
Retailer 3$1,115 SGD
Retailer 13$1,119 SGD
Retailer 7$1,183 SGD
Retailer 10$1,241 SGD
Retailer 11$1,390 SGD
Brilliant Earth$1,637 SGD

36 data points across 16 retailers

17 retailers$280 SGD to $1,637 SGD

A
Cheapest Retailer
-
$280 SGD
$219 USD
A
Retailer 2
-
$313 SGD
$245 USD
View
Final sale: no returns
A
Retailer 3
-
$325 SGD
$254 USD
View
A
Retailer 4
-
$347 SGD
$271 USD
View
Retailer 5
-
$375 SGD
$293 USD
View
Price last confirmed 8 days ago
A
Retailer 6
-
$386 SGD
£238 GBP
View
B+
Retailer 7
-
$467 SGD
$365 USD
View
A
Retailer 8
-
$645 SGD
£397 GBP
View
A
Retailer 9
-
$675 SGD
€503 EUR
View
A
Retailer 10
-
$679 SGD
$531 USD
View
B+
Retailer 11
-
$747 SGD
$584 USD
View
B+
Retailer 12
-
$1,115 SGD
$872 USD
View
B+
Retailer 13
-
$1,119 SGD
$875 USD
View
B+
Retailer 14
-
$1,183 SGD
$925 USD
View
B+
Retailer 15
-
$1,241 SGD
$970 USD
View
B
Retailer 16
-
$1,390 SGD
£856 GBP
View
Most Expensive
B
Brilliant Earth
11225627A · Nov 2
$1,637 SGD
$1,280 USD
View
16 more retailers have this diamond
Prices start from $280 SGDSave up to $1,357 SGD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.66ct Oval
$280 SGD