CaratHunter
Plans
Cushion|Lab Grown|IGI

1.28ct E FL Cushion Lab Grown Diamond

GD • E/FL • IGI LG840622511

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

Certificate IGI LG840622511

Diamond specifications and retailer prices

From $601 AUD
$422 USD
As of October 30, 2026
Save $2,709 AUD (82%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $3,310 AUD at Helzberg Diamonds · As of October 31, 2026
View at Helzberg Diamonds

About this 1.28ct lab-grown cushion diamond

This 1.28ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded E colour (colourless) and FL clarity (flawless or internally-flawless), with a standard cut grade and certified by IGI LG840622511 or 840622511. Listed at 18 retailers as of October 30, 2026, with prices from $601 to $3,310, a $2,709 spread on the same certified stone. Helzberg Diamonds lists it at $3,310. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.28
Carat
E
Colour
FL
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle36.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840622511
Dimensions6.20 × 6.14 × 4.10 mm
L/W Ratio1.01
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
6.20 mm6.14 mm1.28 ctE / FL
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840622511
Side View
Table 62.0%Crown 35.1°Girdle: MED-STKPavilion 36.2°Culet: NoneDepth 66.8%

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: Oct 30
Current: $3,310 AUD|Low: $601 AUD|High: $3,858 AUD|Avg: $1,732 AUD
Helzberg Diamonds
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
October 31, 2026
Retailer 7$601 AUD
Retailer 17$665 AUD
Retailer 13$705 AUD
Retailer 5$1,001 AUD
Retailer 16$1,004 AUD
Retailer 8$1,059 AUD
Retailer 14$1,123 AUD
Retailer 15$1,142 AUD
Retailer 2$1,202 AUD
Retailer 3$1,298 AUD
Retailer 11$1,657 AUD
Retailer 6$2,192 AUD
Retailer 9$2,219 AUD
Retailer 10$2,306 AUD
Retailer 4$2,555 AUD
Retailer 18$2,602 AUD
Retailer 12$2,705 AUD
Helzberg Diamonds$3,310 AUD

18 data points across 18 retailers

18 retailers$601 AUD to $3,310 AUD

A
Cheapest Retailer
-
$601 AUD
$422 USD
Final sale: no returns
A
Retailer 2
-
$665 AUD
$467 USD
View
A
Retailer 3
-
$705 AUD
£390 GBP
View
A
Retailer 4
-
$1,001 AUD
$703 USD
View
B+
Retailer 5
-
$1,004 AUD
$705 USD
View
A
Retailer 6
-
$1,059 AUD
$744 USD
View
A
Retailer 7
-
$1,123 AUD
€751 EUR
View
A
Retailer 8
-
$1,142 AUD
ZAR 12,963 ZAR
View
B+
Retailer 9
-
$1,202 AUD
£665 GBP
View
B+
Retailer 10
-
$1,298 AUD
$912 USD
View
B+
Retailer 11
-
$1,657 AUD
$1,164 USD
View
B
Retailer 12
-
$2,192 AUD
$1,540 USD
View
B
Retailer 13
-
$2,219 AUD
SGD 2,106 SGD
View
Retailer 14
-
$2,306 AUD
$1,620 USD
View
Price last confirmed 17 days ago
B
Retailer 15
-
$2,555 AUD
$1,795 USD
View
B
Retailer 16
-
$2,602 AUD
£1,439 GBP
View
B
Retailer 17
-
$2,705 AUD
$1,900 USD
View
Most Expensive
B
Helzberg Diamonds
ZXZOKGMIILHH · Oct 31
$3,310 AUD
$2,325 USD
View
17 more retailers have this diamond
Prices start from $601 AUDSave up to $2,709 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
1.28ct Cushion
$601 AUD