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1.20ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG780664327

Shape and cutting style on the report: Round brilliant

Certificate IGI LG780664327

Diamond specifications and retailer prices

From $179 USD
As of October 28, 2026
Save $734 USD (80%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $913 USD at MOH London · As of October 29, 2026
View at MOH London

About this 1.2ct lab-grown round diamond

This 1.2ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG780664327 or 780664327. Listed at 10 retailers as of October 28, 2026, with prices from $179 to $913, a $734 spread on the same certified stone. MOH London lists it at $913. 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

1.20
Carat
D
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780664327
Dimensions6.93 × 6.88 × 4.09 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.93 mm6.88 mm1.20 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780664327
Side View
Table 61.0%Crown 33.4°Girdle: MediumPavilion 40.4°Culet: NoneDepth 59.2%

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: Oct 28
Current: $913 USD|Low: $128 USD|High: $1,102 USD|Avg: $547 USD|-2.7%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 9$179 USD
Retailer 11$197 USD
Retailer 10$346 USD
Retailer 7$353 USD
Retailer 2$381 USD
Retailer 6$445 USD
Retailer 12$519 USD
Retailer 5$660 USD
Retailer 3$696 USD
Retailer 8$880 USD
MOH London$913 USD
Retailer 4$1,102 USD

23 data points across 12 retailers

10 retailers$179 USD to $913 USD

Retailer 1
-
$160 USD
Price last confirmed 37 days ago
A
Retailer 2
-
$179 USD
View
Final sale: no returns
Retailer 3
-
$186 USD
View
Price last confirmed 37 days ago
B+
Retailer 4
-
$353 USD
View
B+
Retailer 5
-
$381 USD
€363 EUR
View
B+
Retailer 6
-
$445 USD
View
Retailer 7
-
$638 USD
View
Price last confirmed 33 days ago
B
Retailer 8
-
$660 USD
View
B
Retailer 9
-
$880 USD
View
Most Expensive
B
MOH London
LG780664327 · Oct 29
$913 USD
£719 GBP
View
9 more retailers have this diamond
Prices start from $179 USDSave up to $734 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
1.20ct Round
$179 USD