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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 $219 USD
As of November 1, 2026
Save $1,061 USD (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $1,280 USD 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 $219 to $1,280, a $1,061 spread on the same certified stone. Brilliant Earth lists it at $1,280. 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
Color
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: $1,280 USD|Low: $219 USD|High: $1,280 USD|Avg: $636 USD
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$219 USD
Retailer 6$245 USD
Retailer 5$254 USD
Retailer 14$271 USD
Retailer 2$302 USD
Retailer 16$365 USD
Retailer 9$504 USD
Retailer 12$528 USD
Retailer 15$531 USD
Retailer 4$584 USD
Retailer 3$872 USD
Retailer 13$875 USD
Retailer 7$925 USD
Retailer 10$970 USD
Retailer 11$1,087 USD
Brilliant Earth$1,280 USD

36 data points across 16 retailers

17 retailers$219 USD to $1,280 USD

A
Cheapest Retailer
-
$219 USD
A
Retailer 2
-
$245 USD
View
Final sale: no returns
A
Retailer 3
-
$254 USD
View
A
Retailer 4
-
$271 USD
View
Retailer 5
-
$293 USD
View
Price last confirmed 8 days ago
A
Retailer 6
-
$302 USD
£238 GBP
View
B+
Retailer 7
-
$365 USD
View
A
Retailer 8
-
$504 USD
£397 GBP
View
A
Retailer 9
-
$528 USD
€503 EUR
View
A
Retailer 10
-
$531 USD
View
B+
Retailer 11
-
$584 USD
View
B+
Retailer 12
-
$872 USD
View
B+
Retailer 13
-
$875 USD
View
B+
Retailer 14
-
$925 USD
View
B+
Retailer 15
-
$970 USD
View
B
Retailer 16
-
$1,087 USD
£856 GBP
View
Most Expensive
B
Brilliant Earth
11225627A · Nov 2
$1,280 USD
View
16 more retailers have this diamond
Prices start from $219 USDSave up to $1,061 USD

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
$219 USD