CaratHunter
Plans
Cushion|Lab Grown|IGI

1.51ct D IF Cushion Lab Grown Diamond

EX • D/IF • IGI LG728533556

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG728533556

Diamond specifications and retailer prices

From $737 AUD
As of November 4, 2026
Save $3,525 AUD (83%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $4,262 AUD at Brilliant Earth · As of November 4, 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 LG728533556 or 728533556. Listed at 20 retailers as of November 4, 2026, with prices from $737 to $4,262, a $3,525 spread on the same certified stone. Brilliant Earth lists it at $4,262. 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
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle33.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG728533556
Dimensions6.54 × 6.41 × 4.14 mm
L/W Ratio1.02
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
6.54 mm6.41 mm1.51 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG728533556
Side View
Table 59.0%Crown 34°Girdle: MED-THKPavilion 33.6°Culet: NoneDepth 64.6%

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 4
Current: $4,262 AUD|Low: $737 AUD|High: $6,258 AUD|Avg: $2,274 AUD|-31.9%
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 5, 2026
Retailer 18$737 AUD
Retailer 9$895 AUD
Retailer 8$1,033 AUD
Retailer 3$1,095 AUD
Retailer 5$1,239 AUD
Retailer 10$1,319 AUD
Retailer 13$1,339 AUD
Retailer 16$1,407 AUD
Retailer 17$1,520 AUD
Retailer 2$1,906 AUD
Retailer 15$1,909 AUD
Retailer 14$2,073 AUD
Retailer 6$2,523 AUD
Retailer 19$2,667 AUD
Retailer 4$2,892 AUD
Retailer 11$2,954 AUD
Retailer 12$2,991 AUD
Retailer 7$3,454 AUD
Brilliant Earth$4,262 AUD

37 data points across 19 retailers

20 retailers$737 AUD to $4,262 AUD

A
Cheapest Retailer
-
$737 AUD
Final sale: no returns
Retailer 2
-
$895 AUD
View
Price last confirmed 20 days ago
A
Retailer 3
-
$1,033 AUD
View
A
Retailer 4
-
$1,095 AUD
View
A
Retailer 5
-
$1,239 AUD
View
A
Retailer 6
-
$1,319 AUD
View
A
Retailer 7
-
$1,339 AUD
View
A
Retailer 8
-
$1,407 AUD
View
A
Retailer 9
-
$1,520 AUD
View
A
Retailer 10
-
$1,906 AUD
View
A
Retailer 11
-
$1,909 AUD
View
B+
Retailer 12
-
$2,073 AUD
View
B+
Retailer 13
-
$2,523 AUD
View
B+
Retailer 14
-
$2,667 AUD
View
B+
Retailer 15
-
$2,892 AUD
View
Retailer 16
-
$2,954 AUD
View
Price last confirmed 25 days ago
B+
Retailer 17
-
$2,991 AUD
View
B
Retailer 18
-
$3,454 AUD
View
Retailer 19
-
$4,054 AUD
View
Price last confirmed 9 days ago
Most Expensive
B
Brilliant Earth
15509665A · Nov 4
$4,262 AUD
$2,990 USD
View
19 more retailers have this diamond
Prices start from $737 AUDSave up to $3,525 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
1.51ct Cushion
$737 AUD