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Round|Lab Grown|IGI

1.20ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG451056607

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056607

Diamond specifications and retailer prices

From $690 USD
As of November 5, 2026
Save $3,454 USD (83%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $4,144 USD at MOH London · As of November 5, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451056607 or 451056607. Listed at 13 retailers as of November 5, 2026, with prices from $690 to $4,144, a $3,454 spread on the same certified stone. MOH London lists it at $4,144. 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
J
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.2°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056607
Dimensions6.85 × 6.89 × 4.17 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.85 mm6.89 mm1.20 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056607
Side View
Table 60.0%Crown 32.2°GirdlePavilion 41.5°Culet: NoneDepth 60.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $4,144 USD|Low: $690 USD|High: $4,205 USD|Avg: $1,723 USD|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 6$690 USD
Retailer 7$1,115 USD
Retailer 12$1,213 USD
Retailer 11$1,249 USD
Retailer 8$1,293 USD
Retailer 10$1,293 USD
Retailer 4$1,465 USD
Retailer 5$1,483 USD
Retailer 9$2,057 USD
Retailer 2$2,198 USD
Retailer 3$2,424 USD
MOH London$4,144 USD

45 data points across 12 retailers

13 retailers$690 USD to $4,144 USD

A
Cheapest Retailer
-
$690 USD
B+
Retailer 2
-
$1,115 USD
View
B+
Retailer 3
-
$1,213 USD
View
B+
Retailer 4
-
$1,249 USD
View
Final sale: no returns
Retailer 5
-
$1,293 USD
View
Price last confirmed 25 days ago
B+
Retailer 6
-
$1,293 USD
View
B+
Retailer 7
-
$1,465 USD
View
B+
Retailer 8
-
$1,483 USD
View
B
Retailer 9
-
$2,057 USD
View
B
Retailer 10
-
$2,198 USD
View
B
Retailer 11
-
$2,424 USD
View
B
Retailer 12
-
$2,623 USD
View
Most Expensive
B
MOH London
LG451056607 · Nov 5
$4,144 USD
£3,263 GBP
View
12 more retailers have this diamond
Prices start from $690 USDSave up to $3,454 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
$690 USD