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Round|Lab Grown|IGI

1.51ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG451056217

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056217

Diamond specifications and retailer prices

From $1,200 AUD
As of November 5, 2026
Save $6,113 AUD (84%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $7,313 AUD at MOH London · As of November 3, 2026
View at MOH London

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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451056217 or 451056217. Listed at 11 retailers as of November 3, 2026, with prices from $1,200 to $7,313, a $6,113 spread on the same certified stone. MOH London lists it at $7,313. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056217
Dimensions7.32 × 7.40 × 4.51 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.32 mm7.40 mm1.51 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056217
Side View
Table 61.0%Crown 36°Girdle: MED-STKPavilion 41.1°Culet: NoneDepth 61.4%

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 5
Current: $7,313 AUD|Low: $1,200 AUD|High: $7,411 AUD|Avg: $3,639 AUD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 2$1,200 AUD
Retailer 3$1,963 AUD
Retailer 6$2,196 AUD
Retailer 4$2,276 AUD
Retailer 7$2,521 AUD
Retailer 9$3,114 AUD
Retailer 5$3,596 AUD
Retailer 8$4,243 AUD
Retailer 10$6,514 AUD
MOH London$7,313 AUD

14 data points across 10 retailers

11 retailers$1,200 AUD to $7,313 AUD

A
Cheapest Retailer
-
$1,200 AUD
B+
Retailer 2
-
$1,963 AUD
View
B+
Retailer 3
-
$2,134 AUD
View
B+
Retailer 4
-
$2,196 AUD
View
Final sale: no returns
B+
Retailer 5
-
$2,276 AUD
View
Retailer 6
-
$2,276 AUD
View
Price last confirmed 25 days ago
B
Retailer 7
-
$2,521 AUD
View
B
Retailer 8
-
$3,596 AUD
View
B
Retailer 9
-
$4,243 AUD
View
B
Retailer 10
-
$4,267 AUD
View
Most Expensive
B
MOH London
LG451056217 · Nov 3
$7,313 AUD
£4,031 GBP
View
10 more retailers have this diamond
Prices start from $1,200 AUDSave up to $6,113 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
$1,200 AUD