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Round|Lab Grown|IGI

1.51ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG770643638

Shape and cutting style on the report: Round brilliant

Certificate IGI LG770643638

Diamond specifications and retailer prices

From $362 AUD
As of November 4, 2026
Save $1,485 AUD (80%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $2,067 AUD at Brilliant Earth · As of October 16, 2026
View at Brilliant Earth

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG770643638 or 770643638. Listed at 22 retailers as of November 4, 2026, with a 410% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.51
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG770643638
Dimensions7.36 × 7.31 × 4.56 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.36 mm7.31 mm1.51 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG770643638
Side View
Table 56.0%Crown 35.1°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.3%

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: $2,067 AUD|Low: $310 AUD|High: $2,067 AUD|Avg: $908 AUD
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
November 6, 2026
Retailer 9$326 AUD
Retailer 16$362 AUD
Retailer 5$403 AUD
Retailer 17$403 AUD
Retailer 3$633 AUD
Retailer 6$688 AUD
Retailer 2$699 AUD
Retailer 11$736 AUD
Retailer 12$742 AUD
Retailer 4$773 AUD
Retailer 18$840 AUD
Retailer 14$1,062 AUD
Retailer 10$1,298 AUD
Retailer 15$1,303 AUD
Retailer 8$1,374 AUD
Retailer 13$1,613 AUD
Retailer 7$1,847 AUD
Brilliant Earth$2,067 AUD

41 data points across 18 retailers

22 retailers$362 AUD to $1,847 AUD

Retailer 1
-
$326 AUD
Price last confirmed 19 days ago
A
Retailer 2
-
$362 AUD
View
Final sale: no returns
Retailer 3
-
$374 AUD
View
Price last confirmed 24 days ago
A
Retailer 4
-
$378 AUD
View
Retailer 5
-
$403 AUD
View
Price last confirmed 12 days ago
Retailer 6
-
$403 AUD
View
Price last confirmed 21 days ago
A
Retailer 7
-
$633 AUD
View
A
Retailer 8
-
$688 AUD
View
A
Retailer 9
-
$699 AUD
View
A
Retailer 10
-
$736 AUD
View
A
Retailer 11
-
$742 AUD
View
B+
Retailer 12
-
$773 AUD
View
B+
Retailer 13
-
$840 AUD
View
B+
Retailer 14
-
$1,062 AUD
View
B
Retailer 15
-
$1,122 AUD
View
Retailer 16
-
$1,287 AUD
View
Price last confirmed 46 days ago
Retailer 17
-
$1,298 AUD
View
Price last confirmed 19 days ago
B
Retailer 18
-
$1,303 AUD
View
B
Retailer 19
-
$1,374 AUD
View
B
Retailer 20
-
$1,613 AUD
View
B
Retailer 21
-
$1,847 AUD
View
Most Expensive
Brilliant Earth
19882042A · Oct 16
$2,067 AUD
$1,420 USD
View
Price last confirmed 21 days ago
21 more retailers have this diamond
Prices start from $362 AUDSave up to $1,485 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 Round
$362 AUD