CaratHunter
Plans
Cushion|Lab Grown|IGI

1.28ct E FL Cushion Lab Grown Diamond

VG • E/FL • IGI LG831680109

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

Certificate IGI LG831680109

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)
12 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 very-good cut grade and certified by IGI LG831680109 or 831680109. Listed at 12 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
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.7°
Pavilion angle36°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831680109
Dimensions6.10 × 6.07 × 4.05 mm
L/W Ratio1.00
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
6.10 mm6.07 mm1.28 ctE / FL
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG831680109
Side View
Table 60.0%Crown 36.7°Girdle: STK-VTKPavilion 36°Culet: NoneDepth 66.7%

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: $1,613 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
October 31, 2026
Retailer 3$601 AUD
Retailer 8$705 AUD
Retailer 12$876 AUD
Retailer 5$1,001 AUD
Retailer 7$1,059 AUD
Retailer 2$1,202 AUD
Retailer 10$1,298 AUD
Retailer 11$2,192 AUD
Retailer 4$2,219 AUD
Retailer 9$2,555 AUD
Retailer 6$2,705 AUD
Helzberg Diamonds$3,310 AUD

3 data points across 12 retailers

12 retailers$601 AUD to $3,310 AUD

A
Cheapest Retailer
-
$601 AUD
$422 USD
Final sale: no returns
A
Retailer 2
-
$705 AUD
£390 GBP
View
A
Retailer 3
-
$876 AUD
$615 USD
View
A
Retailer 4
-
$1,001 AUD
$703 USD
View
A
Retailer 5
-
$1,059 AUD
$744 USD
View
A
Retailer 6
-
$1,202 AUD
£665 GBP
View
A
Retailer 7
-
$1,298 AUD
$912 USD
View
B
Retailer 8
-
$2,192 AUD
$1,540 USD
View
B
Retailer 9
-
$2,219 AUD
SGD 2,106 SGD
View
B
Retailer 10
-
$2,555 AUD
$1,795 USD
View
B
Retailer 11
-
$2,705 AUD
$1,900 USD
View
Most Expensive
B
Helzberg Diamonds
ZXZOJHMOGHGP · Oct 31
$3,310 AUD
$2,325 USD
View
11 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