Round|Lab Grown|IGI

1.28ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG818686822

Shape and cutting style on the report: Round brilliant

Certificate IGI LG818686822

Diamond specifications and retailer prices

From $171 USD
As of November 1, 2026
Save $821 USD (83%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $992 USD at MOH London · As of November 1, 2026
View at MOH London

About this 1.28ct lab-grown round diamond

This 1.28ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG818686822 or 818686822. Listed at 16 retailers as of November 1, 2026, with prices from $171 to $992, a $821 spread on the same certified stone. MOH London lists it at $992. 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

1.28
Carat
G
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818686822
Dimensions6.99 × 7.00 × 4.28 mm
L/W Ratio1.00
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.99 mm7.00 mm1.28 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818686822
Side View
Table 58.0%Crown 34.4°Girdle: MediumPavilion 41°Culet: NoneDepth 61.2%

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 1
Current: $992 USD|Low: $164 USD|High: $1,003 USD|Avg: $467 USD|-1.1%
MOH London
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
November 1, 2026
Retailer 13$171 USD
Retailer 15$198 USD
Retailer 3$212 USD
Retailer 4$212 USD
Retailer 10$366 USD
Retailer 9$378 USD
Retailer 16$379 USD
Retailer 7$455 USD
Retailer 6$464 USD
Retailer 12$470 USD
Retailer 2$472 USD
Retailer 11$532 USD
Retailer 14$580 USD
Retailer 5$682 USD
Retailer 8$736 USD
MOH London$992 USD

29 data points across 16 retailers

16 retailers$171 USD to $992 USD

A
Cheapest Retailer
-
$171 USD
A
Retailer 2
-
$198 USD
View
Retailer 3
-
$212 USD
View
Price last confirmed 7 days ago
A
Retailer 4
-
$212 USD
View
A
Retailer 5
-
$366 USD
€349 EUR
View
A
Retailer 6
-
$378 USD
£297 GBP
View
B+
Retailer 7
-
$379 USD
View
B+
Retailer 8
-
$455 USD
View
B+
Retailer 9
-
$464 USD
View
Retailer 10
-
$470 USD
View
Price last confirmed 11 days ago
A
Retailer 11
-
$472 USD
£372 GBP
View
B+
Retailer 12
-
$532 USD
View
B+
Retailer 13
-
$580 USD
View
B
Retailer 14
-
$682 USD
View
B+
Retailer 15
-
$736 USD
View
Most Expensive
B
MOH London
LG818686822 · Nov 1
$992 USD
£781 GBP
View
15 more retailers have this diamond
Prices start from $171 USDSave up to $821 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
1.28ct Round
$171 USD