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Radiant|Lab Grown|IGI

1.55ct D IF Radiant Lab Grown Diamond

ID • D/IF • IGI LG728538606

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

Certificate IGI LG728538606

Diamond specifications and retailer prices

From $406 AUD
As of November 4, 2026
Save $3,742 AUD (90%) vs most expensive(unlock to see where)
30 retailers carry this diamond
Most expensive: $4,148 AUD at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.55ct lab-grown radiant diamond

This 1.55ct lab-grown radiant 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 LG728538606 or 728538606. Listed at 30 retailers as of November 4, 2026, with prices from $406 to $4,148, a $3,742 spread on the same certified stone. Brilliant Earth lists it at $4,148. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.55
Carat
D
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.4°
Pavilion angle34.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG728538606
Dimensions8.14 × 5.88 × 3.88 mm
L/W Ratio1.38
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
8.14 mm5.88 mm1.55 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG728538606
Side View
Table 64.0%Crown 39.4°Girdle: MediumPavilion 34.6°Culet: NoneDepth 66.0%

Caratlytics Score

How it works →
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: $4,148 AUD|Low: $406 AUD|High: $4,775 AUD|Avg: $1,752 AUD|-13.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
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Retailer 11
Retailer 12
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Retailer 23
November 5, 2026
Retailer 19$406 AUD
Retailer 9$485 AUD
Retailer 17$727 AUD
Retailer 18$747 AUD
Retailer 21$784 AUD
Retailer 16$898 AUD
Retailer 5$907 AUD
Retailer 2$982 AUD
Retailer 10$999 AUD
Retailer 14$1,179 AUD
Retailer 7$1,253 AUD
Retailer 4$1,307 AUD
Retailer 22$1,550 AUD
Retailer 20$1,790 AUD
Retailer 6$1,939 AUD
Retailer 8$2,021 AUD
Retailer 23$2,084 AUD
Retailer 3$2,154 AUD
Retailer 13$2,224 AUD
Retailer 12$2,415 AUD
Retailer 11$3,500 AUD
Retailer 15$3,763 AUD
Brilliant Earth$4,148 AUD

36 data points across 23 retailers

30 retailers$406 AUD to $4,148 AUD

A
Cheapest Retailer
-
$406 AUD
Retailer 2
-
$423 AUD
View
Price last confirmed 28 days ago
Retailer 3
-
$450 AUD
View
Price last confirmed 36 days ago
A
Retailer 4
-
$485 AUD
View
Final sale: no returns
Retailer 5
-
$523 AUD
View
Price last confirmed 39 days ago
Retailer 6
-
$526 AUD
View
Price last confirmed 33 days ago
Retailer 7
-
$552 AUD
View
Price last confirmed 37 days ago
A
Retailer 8
-
$727 AUD
View
A
Retailer 9
-
$747 AUD
View
A
Retailer 10
-
$784 AUD
View
A
Retailer 11
-
$898 AUD
View
A
Retailer 12
-
$907 AUD
View
A
Retailer 13
-
$982 AUD
View
A
Retailer 14
-
$999 AUD
View
A
Retailer 15
-
$1,179 AUD
View
A
Retailer 16
-
$1,253 AUD
View
A
Retailer 17
-
$1,307 AUD
View
B+
Retailer 18
-
$1,550 AUD
View
B+
Retailer 19
-
$1,790 AUD
View
Retailer 20
-
$1,865 AUD
View
Price last confirmed 26 days ago
B+
Retailer 21
-
$1,939 AUD
View
Retailer 22
-
$1,983 AUD
View
Price last confirmed 36 days ago
B+
Retailer 23
-
$2,021 AUD
View
B+
Retailer 24
-
$2,084 AUD
View
B+
Retailer 25
-
$2,154 AUD
View
B+
Retailer 26
-
$2,224 AUD
View
Retailer 27
-
$2,415 AUD
View
Price last confirmed 31 days ago
Retailer 28
-
$3,500 AUD
View
Price last confirmed 8 days ago
B
Retailer 29
-
$3,763 AUD
View
Most Expensive
B
Brilliant Earth
16223266Y · Nov 4
$4,148 AUD
$2,910 USD
View
29 more retailers have this diamond
Prices start from $406 AUDSave up to $3,742 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
1.55ct Radiant
$406 AUD