Cushion|Lab Grown|IGI

1.51ct D IF Cushion Lab Grown Diamond

ID • D/IF • IGI LG843667687

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG843667687

Diamond specifications and retailer prices

From $523 USD
£412 GBP
As of November 2, 2026
Save $2,687 USD (84%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $4,390 USD at Brilliant Earth · As of October 15, 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 LG843667687 or 843667687. Listed at 13 retailers as of November 2, 2026, with a 514% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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 angle33.2°
Pavilion angle32.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG843667687
Dimensions8.82 × 5.59 × 3.79 mm
L/W Ratio1.58
Girdle conditionFaceted
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
8.82 mm5.59 mm1.51 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG843667687
Side View
Table 58.0%Crown 33.2°Girdle: STK-VTKPavilion 32.1°Culet: NoneDepth 67.8%

Caratlytics Score

How it works →
A+
Exceptional
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 2
Current: $2,830 USD|Low: $523 USD|High: $3,970 USD|Avg: $1,601 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
November 2, 2026
Retailer 2$523 USD
Retailer 9$645 USD
Retailer 11$717 USD
Retailer 5$807 USD
Retailer 12$819 USD
Retailer 7$1,152 USD
Retailer 8$1,943 USD
Retailer 4$2,249 USD
Retailer 6$2,424 USD
Retailer 3$2,515 USD
Brilliant Earth$2,830 USD
Retailer 10$3,210 USD

19 data points across 12 retailers

13 retailers$523 USD to $3,210 USD

A+
Cheapest Retailer
-
$523 USD
£412 GBP
A
Retailer 2
-
$645 USD
View
A
Retailer 3
-
$717 USD
View
A
Retailer 4
-
$807 USD
€769 EUR
View
A
Retailer 5
-
$819 USD
View
A
Retailer 6
-
$1,152 USD
A$1,773 AUD
View
B+
Retailer 7
-
$1,943 USD
£1,530 GBP
View
Retailer 8
-
$2,249 USD
View
Price last confirmed 18 days ago
B
Retailer 9
-
$2,424 USD
A$3,729 AUD
View
Retailer 10
-
$2,515 USD
View
Price last confirmed 15 days ago
B+
Retailer 11
-
$2,830 USD
View
B
Retailer 12
-
$3,210 USD
View
Most Expensive
Brilliant Earth
21768659A · Oct 15
$4,390 USD
View
Price last confirmed 18 days ago
12 more retailers have this diamond
Prices start from $523 USDSave up to $2,687 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
$523 USD