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Radiant|Lab Grown|IGI

1.66ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG844602074

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG844602074

Diamond specifications and retailer prices

From $279 USD
As of November 2, 2026
Save $3,111 USD (92%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $3,390 USD at Brilliant Earth · As of November 2, 2026
View at Brilliant Earth

About this 1.66ct lab-grown radiant diamond

This 1.66ct lab-grown radiant sits in the one-and-a-half to two carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG844602074 or 844602074. Listed at 18 retailers as of November 2, 2026, with prices from $279 to $3,390, a $3,111 spread on the same certified stone. Brilliant Earth lists it at $3,390. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.66
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46°
Pavilion angle33.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG844602074
Dimensions8.51 × 5.78 × 3.86 mm
L/W Ratio1.47
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
8.51 mm5.78 mm1.66 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG844602074
Side View
Table 66.0%Crown 46°Girdle: Slightly ThickPavilion 33.5°Culet: NoneDepth 66.8%

Caratlytics Score

How it works →
A+
Exceptional
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $3,390 USD|Low: $279 USD|High: $3,820 USD|Avg: $1,324 USD|-11.3%
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
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Retailer 17
Retailer 18
November 3, 2026
Retailer 15$279 USD
Retailer 6$323 USD
Retailer 11$403 USD
Retailer 13$505 USD
Retailer 16$523 USD
Retailer 3$571 USD
Retailer 12$633 USD
Retailer 14$889 USD
Retailer 8$946 USD
Retailer 18$1,062 USD
Retailer 5$1,093 USD
Retailer 4$1,226 USD
Retailer 10$1,430 USD
Retailer 2$1,529 USD
Retailer 17$2,480 USD
Retailer 9$2,875 USD
Retailer 7$3,126 USD
Brilliant Earth$3,390 USD

19 data points across 18 retailers

18 retailers$279 USD to $3,390 USD

A+
Cheapest Retailer
-
$279 USD
A
Retailer 2
-
$323 USD
View
A
Retailer 3
-
$403 USD
£318 GBP
View
A
Retailer 4
-
$505 USD
View
A
Retailer 5
-
$523 USD
View
A
Retailer 6
-
$571 USD
View
A
Retailer 7
-
$633 USD
€603 EUR
View
A
Retailer 8
-
$889 USD
A$1,368 AUD
View
A
Retailer 9
-
$946 USD
View
A
Retailer 10
-
$1,062 USD
View
A
Retailer 11
-
$1,093 USD
View
B+
Retailer 12
-
$1,226 USD
View
Retailer 13
-
$1,430 USD
View
Price last confirmed 18 days ago
B+
Retailer 14
-
$1,529 USD
£1,204 GBP
View
B
Retailer 15
-
$2,480 USD
View
B
Retailer 16
-
$2,875 USD
View
B
Retailer 17
-
$3,126 USD
View
Most Expensive
B
Brilliant Earth
22166202Y · Nov 2
$3,390 USD
View
17 more retailers have this diamond
Prices start from $279 USDSave up to $3,111 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 Radiant
$279 USD