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Round|Lab Grown|IGI

1.18ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG780656624

Shape and cutting style on the report: Round brilliant

Certificate IGI LG780656624

Diamond specifications and retailer prices

From $258 USD
As of November 6, 2026
Save $625 USD (71%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $883 USD at MOH London · As of November 4, 2026
View at MOH London

About this 1.18ct lab-grown round diamond

This 1.18ct lab-grown round sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG780656624 or 780656624. Listed at 6 retailers as of November 4, 2026, with prices from $258 to $883, a $625 spread on the same certified stone. MOH London lists it at $883. 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

1.18
Carat
F
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780656624
Dimensions6.80 × 6.86 × 4.11 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.80 mm6.86 mm1.18 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780656624
Side View
Table 62.0%Crown 33.1°Girdle: MediumPavilion 41.3°Culet: NoneDepth 60.2%

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 6
Current: $883 USD|Low: $98 USD|High: $890 USD|Avg: $415 USD|-0.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 6$258 USD
Retailer 2$321 USD
Retailer 3$326 USD
Retailer 4$352 USD
Retailer 5$440 USD
MOH London$883 USD

23 data points across 6 retailers

6 retailers$258 USD to $883 USD

B+
Cheapest Retailer
-
$258 USD
A
Retailer 2
-
$321 USD
View
A
Retailer 3
-
$326 USD
View
A
Retailer 4
-
$352 USD
View
B+
Retailer 5
-
$440 USD
View
Most Expensive
B
MOH London
LG780656624 · Nov 4
$883 USD
£695 GBP
View
5 more retailers have this diamond
Prices start from $258 USDSave up to $625 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
1.18ct Round
$258 USD