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Round|Lab Grown|IGI

1.25ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG517289198

Shape and cutting style on the report: Round brilliant

Certificate IGI LG517289198

Diamond specifications and retailer prices

From $243 AUD
As of November 5, 2026
Save $1,161 AUD (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $1,404 AUD at MOH London · As of November 2, 2026
View at MOH London

About this 1.25ct lab-grown round diamond

This 1.25ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG517289198 or 517289198. Listed at 17 retailers as of November 2, 2026, with prices from $243 to $1,404, a $1,161 spread on the same certified stone. MOH London lists it at $1,404. 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

1.25
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG517289198
Dimensions6.89 × 6.85 × 4.27 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.89 mm6.85 mm1.25 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG517289198
Side View
Table 55.0%Crown 35.5°Girdle: MediumPavilion 40.4°Culet: NoneDepth 62.1%

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: $1,404 AUD|Low: $233 AUD|High: $1,421 AUD|Avg: $641 AUD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 7$243 AUD
Retailer 10$271 AUD
Retailer 8$300 AUD
Retailer 4$517 AUD
Retailer 3$529 AUD
Retailer 2$590 AUD
Retailer 9$659 AUD
Retailer 5$987 AUD
Retailer 6$1,020 AUD
MOH London$1,404 AUD

44 data points across 10 retailers

17 retailers$243 AUD to $1,404 AUD

A
Cheapest Retailer
-
$243 AUD
A
Retailer 2
-
$271 AUD
View
Final sale: no returns
A
Retailer 3
-
$281 AUD
View
Retailer 4
-
$300 AUD
View
Price last confirmed 12 days ago
A
Retailer 5
-
$300 AUD
View
A
Retailer 6
-
$347 AUD
View
B+
Retailer 7
-
$411 AUD
View
A
Retailer 8
-
$517 AUD
View
A
Retailer 9
-
$529 AUD
View
A
Retailer 10
-
$570 AUD
View
A
Retailer 11
-
$590 AUD
View
B+
Retailer 12
-
$659 AUD
View
Retailer 13
-
$721 AUD
View
Price last confirmed 58 days ago
B
Retailer 14
-
$966 AUD
View
B
Retailer 15
-
$987 AUD
View
B
Retailer 16
-
$1,020 AUD
View
Most Expensive
B
MOH London
LG517289198 · Nov 2
$1,404 AUD
£774 GBP
View
16 more retailers have this diamond
Prices start from $243 AUDSave up to $1,161 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
1.25ct Round
$243 AUD