CaratHunter
Plans
Cushion|Lab Grown|IGI

1.51ct D IF Cushion Lab Grown Diamond

ID • D/IF • IGI LG665408926

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG665408926

Diamond specifications and retailer prices

From $655 USD
As of November 3, 2026
Save $3,745 USD (85%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $4,400 USD at Brilliant Earth · As of November 3, 2026
View at Brilliant Earth

About this 1.51ct lab-grown cushion diamond

This 1.51ct lab-grown cushion 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 LG665408926 or 665408926. Listed at 20 retailers as of November 3, 2026, with prices from $655 to $4,400, a $3,745 spread on the same certified stone. Brilliant Earth lists it at $4,400. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.9°
Pavilion angle36.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG665408926
Dimensions7.48 × 6.17 × 4.19 mm
L/W Ratio1.21
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
7.48 mm6.17 mm1.51 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG665408926
Side View
Table 59.0%Crown 35.9°Girdle: MED-THKPavilion 36.7°Culet: NoneDepth 67.9%

Caratlytics Score

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

Price History

Last verified: Nov 3
Current: $4,400 USD|Low: $648 USD|High: $4,400 USD|Avg: $1,818 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
Retailer 17
Retailer 18
Retailer 19
November 3, 2026
Retailer 18$655 USD
Retailer 6$725 USD
Retailer 19$840 USD
Retailer 5$937 USD
Retailer 4$1,107 USD
Retailer 7$1,115 USD
Retailer 2$1,134 USD
Retailer 14$1,247 USD
Retailer 13$1,268 USD
Retailer 12$1,667 USD
Retailer 17$1,690 USD
Retailer 10$2,118 USD
Retailer 11$2,307 USD
Retailer 9$2,349 USD
Retailer 8$2,422 USD
Retailer 16$2,424 USD
Retailer 3$2,675 USD
Retailer 15$3,150 USD
Brilliant Earth$4,400 USD

37 data points across 19 retailers

20 retailers$655 USD to $4,400 USD

A
Cheapest Retailer
-
$655 USD
Final sale: no returns
Retailer 2
-
$725 USD
View
Price last confirmed 18 days ago
A
Retailer 3
-
$840 USD
View
A
Retailer 4
-
$937 USD
View
A
Retailer 5
-
$1,107 USD
View
A
Retailer 6
-
$1,115 USD
View
A
Retailer 7
-
$1,134 USD
£893 GBP
View
A
Retailer 8
-
$1,247 USD
ZAR 20,144 ZAR
View
A
Retailer 9
-
$1,268 USD
€1,208 EUR
View
B+
Retailer 10
-
$1,667 USD
View
B+
Retailer 11
-
$1,690 USD
A$2,600 AUD
View
B+
Retailer 12
-
$2,118 USD
£1,668 GBP
View
B+
Retailer 13
-
$2,307 USD
View
B+
Retailer 14
-
$2,349 USD
View
B+
Retailer 15
-
$2,422 USD
View
B+
Retailer 16
-
$2,424 USD
A$3,729 AUD
View
B
Retailer 17
-
$2,517 USD
View
Retailer 18
-
$2,675 USD
View
Price last confirmed 15 days ago
B+
Retailer 19
-
$3,150 USD
£2,480 GBP
View
Most Expensive
B
Brilliant Earth
14720055A · Nov 3
$4,400 USD
View
19 more retailers have this diamond
Prices start from $655 USDSave up to $3,745 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
1.51ct Cushion
$655 USD