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Round|Lab Grown|IGI

1.28ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG788620074

Shape and cutting style on the report: Round brilliant

Certificate IGI LG788620074

Diamond specifications and retailer prices

From $171 USD
As of November 5, 2026
Save $821 USD (83%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $992 USD at MOH London · As of November 2, 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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG788620074 or 788620074. Listed at 15 retailers as of November 2, 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
F
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG788620074
Dimensions7.06 × 7.03 × 4.18 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.06 mm7.03 mm1.28 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG788620074
Side View
Table 61.0%Crown 33°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 59.3%

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: $992 USD|Low: $171 USD|High: $1,003 USD|Avg: $492 USD
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$171 USD
Retailer 8$212 USD
Retailer 2$364 USD
Retailer 4$373 USD
Retailer 9$379 USD
Retailer 5$460 USD
Retailer 10$464 USD
Retailer 6$539 USD
Retailer 3$630 USD
MOH London$992 USD

43 data points across 10 retailers

15 retailers$171 USD to $992 USD

A
Cheapest Retailer
-
$171 USD
A
Retailer 2
-
$198 USD
View
A
Retailer 3
-
$212 USD
View
Retailer 4
-
$212 USD
View
Price last confirmed 12 days ago
A
Retailer 5
-
$364 USD
View
A
Retailer 6
-
$373 USD
View
B+
Retailer 7
-
$379 USD
View
A
Retailer 8
-
$409 USD
View
A
Retailer 9
-
$460 USD
View
B+
Retailer 10
-
$464 USD
View
B+
Retailer 11
-
$539 USD
View
B+
Retailer 12
-
$630 USD
View
B
Retailer 13
-
$682 USD
View
B+
Retailer 14
-
$736 USD
View
Most Expensive
B
MOH London
LG788620074 · Nov 2
$992 USD
£781 GBP
View
14 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