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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 $312 AUD
$219 USD
As of November 1, 2026
Save $1,510 AUD (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $1,822 AUD 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 $312 to $1,822, a $1,510 spread on the same certified stone. Brilliant Earth lists it at $1,822. 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: $1,822 AUD|Low: $312 AUD|High: $1,822 AUD|Avg: $906 AUD
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$312 AUD
Retailer 6$349 AUD
Retailer 5$362 AUD
Retailer 14$386 AUD
Retailer 2$430 AUD
Retailer 16$520 AUD
Retailer 9$718 AUD
Retailer 12$752 AUD
Retailer 15$756 AUD
Retailer 4$831 AUD
Retailer 3$1,241 AUD
Retailer 13$1,246 AUD
Retailer 7$1,317 AUD
Retailer 10$1,381 AUD
Retailer 11$1,548 AUD
Brilliant Earth$1,822 AUD

36 data points across 16 retailers

17 retailers$312 AUD to $1,822 AUD

A
Cheapest Retailer
-
$312 AUD
$219 USD
A
Retailer 2
-
$349 AUD
$245 USD
View
Final sale: no returns
A
Retailer 3
-
$362 AUD
$254 USD
View
A
Retailer 4
-
$386 AUD
$271 USD
View
Retailer 5
-
$417 AUD
$293 USD
View
Price last confirmed 8 days ago
A
Retailer 6
-
$430 AUD
£238 GBP
View
B+
Retailer 7
-
$520 AUD
$365 USD
View
A
Retailer 8
-
$718 AUD
£397 GBP
View
A
Retailer 9
-
$752 AUD
€503 EUR
View
A
Retailer 10
-
$756 AUD
$531 USD
View
B+
Retailer 11
-
$831 AUD
$584 USD
View
B+
Retailer 12
-
$1,241 AUD
$872 USD
View
B+
Retailer 13
-
$1,246 AUD
$875 USD
View
B+
Retailer 14
-
$1,317 AUD
$925 USD
View
B+
Retailer 15
-
$1,381 AUD
$970 USD
View
B
Retailer 16
-
$1,548 AUD
£856 GBP
View
Most Expensive
B
Brilliant Earth
11225627A · Nov 2
$1,822 AUD
$1,280 USD
View
16 more retailers have this diamond
Prices start from $312 AUDSave up to $1,510 AUD

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
$312 AUD