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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 €618 EUR
$690 USD
As of October 31, 2026
Save €3,121 EUR (83%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: €3,739 EUR 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 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 October 29, 2026, with prices from €618 to €3,739, a €3,121 spread on the same certified stone. MOH London lists it at €3,739. 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
undefined
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: Oct 31
Current: €3,739 EUR|Low: €618 EUR|High: €3,764 EUR|Avg: €1,599 EUR|-0.5%
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
October 31, 2026
Retailer 7€618 EUR
Retailer 9€998 EUR
Retailer 14€1,086 EUR
Retailer 13€1,118 EUR
Retailer 10€1,157 EUR
Retailer 12€1,157 EUR
Retailer 4€1,311 EUR
Retailer 8€1,340 EUR
Retailer 5€1,645 EUR
Retailer 11€1,841 EUR
Retailer 2€1,978 EUR
Retailer 3€2,170 EUR
Retailer 6€2,348 EUR
MOH London€3,739 EUR

43 data points across 14 retailers

13 retailers€618 EUR to €3,739 EUR

A
Cheapest Retailer
-
€618 EUR
$690 USD
B+
Retailer 2
-
€998 EUR
$1,115 USD
View
B+
Retailer 3
-
€1,086 EUR
$1,213 USD
View
B+
Retailer 4
-
€1,118 EUR
$1,249 USD
View
Final sale: no returns
Retailer 5
-
€1,157 EUR
$1,293 USD
View
Price last confirmed 19 days ago
B+
Retailer 6
-
€1,157 EUR
$1,293 USD
View
B+
Retailer 7
-
€1,311 EUR
$1,465 USD
View
B+
Retailer 8
-
€1,340 EUR
£1,179 GBP
View
B
Retailer 9
-
€1,841 EUR
$2,057 USD
View
B
Retailer 10
-
€1,978 EUR
View
B
Retailer 11
-
€2,170 EUR
$2,424 USD
View
B
Retailer 12
-
€2,348 EUR
$2,623 USD
View
Most Expensive
B
MOH London
LG451056607 · Oct 29
€3,739 EUR
£3,289 GBP
View
12 more retailers have this diamond
Prices start from €618 EURSave up to €3,121 EUR

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
€618 EUR