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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 $306 CAD
$219 USD
As of November 1, 2026
Save $1,482 CAD (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $1,788 CAD at Brilliant Earth · As of October 31, 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 October 31, 2026, with prices from $306 to $1,788, a $1,482 spread on the same certified stone. Brilliant Earth lists it at $1,788. 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: $1,788 CAD|Low: $306 CAD|High: $1,788 CAD|Avg: $888 CAD
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$306 CAD
Retailer 6$342 CAD
Retailer 5$355 CAD
Retailer 14$379 CAD
Retailer 11$422 CAD
Retailer 16$510 CAD
Retailer 2$704 CAD
Retailer 12$738 CAD
Retailer 15$742 CAD
Retailer 4$816 CAD
Retailer 3$1,218 CAD
Retailer 13$1,222 CAD
Retailer 7$1,292 CAD
Retailer 9$1,355 CAD
Retailer 10$1,519 CAD
Brilliant Earth$1,788 CAD

37 data points across 16 retailers

17 retailers$306 CAD to $1,788 CAD

A
Cheapest Retailer
-
$306 CAD
$219 USD
A
Retailer 2
-
$342 CAD
$245 USD
View
Final sale: no returns
A
Retailer 3
-
$355 CAD
$254 USD
View
A
Retailer 4
-
$379 CAD
$271 USD
View
Retailer 5
-
$409 CAD
$293 USD
View
Price last confirmed 7 days ago
A
Retailer 6
-
$422 CAD
£238 GBP
View
B+
Retailer 7
-
$510 CAD
$365 USD
View
A
Retailer 8
-
$704 CAD
£397 GBP
View
A
Retailer 9
-
$738 CAD
€503 EUR
View
A
Retailer 10
-
$742 CAD
$531 USD
View
B+
Retailer 11
-
$816 CAD
$584 USD
View
B+
Retailer 12
-
$1,218 CAD
$872 USD
View
B+
Retailer 13
-
$1,222 CAD
$875 USD
View
B+
Retailer 14
-
$1,292 CAD
$925 USD
View
B+
Retailer 15
-
$1,355 CAD
$970 USD
View
B
Retailer 16
-
$1,519 CAD
£856 GBP
View
Most Expensive
B
Brilliant Earth
11225627A · Oct 31
$1,788 CAD
$1,280 USD
View
16 more retailers have this diamond
Prices start from $306 CADSave up to $1,482 CAD

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
$306 CAD