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Radiant|Lab Grown|IGI

1.28ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG836617943

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG836617943

Diamond specifications and retailer prices

From $303 AUD
As of November 4, 2026
Save $2,670 AUD (90%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $2,973 AUD at Helzberg Diamonds · As of November 4, 2026
View at Helzberg Diamonds

About this 1.28ct lab-grown radiant diamond

This 1.28ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG836617943 or 836617943. Listed at 20 retailers as of November 4, 2026, with prices from $303 to $2,973, a $2,670 spread on the same certified stone. Helzberg Diamonds lists it at $2,973. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.9°
Pavilion angle35.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG836617943
Dimensions8.00 × 5.43 × 3.57 mm
L/W Ratio1.47
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
8.00 mm5.43 mm1.28 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG836617943
Side View
Table 66.0%Crown 40.9°Girdle: MediumPavilion 35.1°Culet: NoneDepth 65.7%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $2,973 AUD|Low: $303 AUD|High: $3,528 AUD|Avg: $1,113 AUD
Helzberg Diamonds
Retailer 2
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Retailer 21
November 6, 2026
Retailer 6$303 AUD
Retailer 11$339 AUD
Retailer 3$350 AUD
Retailer 4$374 AUD
Retailer 8$374 AUD
Retailer 21$387 AUD
Retailer 7$644 AUD
Retailer 17$646 AUD
Retailer 18$681 AUD
Retailer 2$686 AUD
Retailer 10$726 AUD
Retailer 15$916 AUD
Retailer 16$981 AUD
Retailer 5$1,193 AUD
Retailer 9$1,204 AUD
Retailer 12$1,280 AUD
Retailer 14$1,430 AUD
Retailer 13$1,498 AUD
Retailer 20$2,650 AUD
Retailer 19$2,671 AUD
Helzberg Diamonds$2,973 AUD

30 data points across 21 retailers

20 retailers$303 AUD to $2,973 AUD

A
Cheapest Retailer
-
$303 AUD
A
Retailer 2
-
$339 AUD
View
Final sale: no returns
A
Retailer 3
-
$350 AUD
View
A
Retailer 4
-
$374 AUD
View
Retailer 5
-
$374 AUD
View
Price last confirmed 12 days ago
A
Retailer 6
-
$644 AUD
View
A
Retailer 7
-
$646 AUD
View
A
Retailer 8
-
$681 AUD
View
A
Retailer 9
-
$686 AUD
View
A
Retailer 10
-
$726 AUD
View
A
Retailer 11
-
$916 AUD
View
A
Retailer 12
-
$981 AUD
View
B+
Retailer 13
-
$1,193 AUD
View
B+
Retailer 14
-
$1,204 AUD
View
B+
Retailer 15
-
$1,280 AUD
View
B+
Retailer 16
-
$1,417 AUD
View
B+
Retailer 17
-
$1,498 AUD
View
Retailer 18
-
$2,650 AUD
View
Price last confirmed 19 days ago
B
Retailer 19
-
$2,671 AUD
View
Most Expensive
B
Helzberg Diamonds
ZXZOJMMHNPKJ · Nov 4
$2,973 AUD
$2,081 USD
View
19 more retailers have this diamond
Prices start from $303 AUDSave up to $2,670 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 Radiant
$303 AUD