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1.29ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG586375242

Shape and cutting style on the report: Round brilliant

Certificate IGI LG586375242

Diamond specifications and retailer prices

From $340 USD
As of November 5, 2026
Save $574 USD (63%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $914 USD at MOH London · As of November 4, 2026
View at MOH London

About this 1.29ct lab-grown round diamond

This 1.29ct 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 LG586375242 or 586375242. Listed at 6 retailers as of November 4, 2026, with prices from $340 to $914, a $574 spread on the same certified stone. MOH London lists it at $914. 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

1.29
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.8°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG586375242
Dimensions6.96 × 6.91 × 4.31 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
6.96 mm6.91 mm1.29 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG586375242
Side View
Table 59.0%Crown 35.8°Girdle: MediumPavilion 40.9°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: $914 USD|Low: $325 USD|High: $987 USD|Avg: $517 USD|-6.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 5, 2026
Retailer 2$340 USD
Retailer 4$355 USD
Retailer 3$415 USD
Retailer 5$480 USD
Retailer 6$525 USD
MOH London$914 USD

40 data points across 6 retailers

6 retailers$340 USD to $914 USD

A
Cheapest Retailer
-
$340 USD
B+
Retailer 2
-
$355 USD
View
A
Retailer 3
-
$415 USD
View
B+
Retailer 4
-
$480 USD
View
B+
Retailer 5
-
$525 USD
View
Most Expensive
B
MOH London
LG586375242 · Nov 4
$914 USD
£720 GBP
View
5 more retailers have this diamond
Prices start from $340 USDSave up to $574 USD

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
1.29ct Round
$340 USD