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Round|Lab Grown|IGI

1.20ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG436074550

Shape and cutting style on the report: Round brilliant

Certificate IGI LG436074550

Diamond specifications and retailer prices

From $620 USD
As of October 29, 2026
Save $4,507 USD (88%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $5,127 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG436074550 or 436074550. Listed at 13 retailers as of October 29, 2026, with prices from $620 to $5,127, a $4,507 spread on the same certified stone. MOH London lists it at $5,127. 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
I
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436074550
Dimensions6.79 × 6.82 × 4.17 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
6.79 mm6.82 mm1.20 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436074550
Side View
Table 59.5%Crown 33.4°Girdle: UNDPavilion 41.1°Culet: NoneDepth 61.3%

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 29
Current: $5,127 USD|Low: $620 USD|High: $5,168 USD|Avg: $2,343 USD|+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
Retailer 15
October 30, 2026
Retailer 11$620 USD
Retailer 10$1,368 USD
Retailer 3$1,489 USD
Retailer 15$1,532 USD
Retailer 12$1,587 USD
Retailer 14$1,587 USD
Retailer 9$1,760 USD
Retailer 2$2,084 USD
Retailer 5$2,160 USD
Retailer 13$2,508 USD
Retailer 8$2,711 USD
Retailer 6$2,958 USD
Retailer 4$2,975 USD
Retailer 7$4,544 USD
MOH London$5,127 USD

39 data points across 15 retailers

13 retailers$620 USD to $5,127 USD

A
Cheapest Retailer
-
$620 USD
B+
Retailer 2
-
$1,368 USD
View
B+
Retailer 3
-
$1,489 USD
View
B+
Retailer 4
-
$1,532 USD
View
Final sale: no returns
Retailer 5
-
$1,587 USD
View
Price last confirmed 18 days ago
B+
Retailer 6
-
$1,587 USD
View
B+
Retailer 7
-
$1,760 USD
View
B+
Retailer 8
-
$2,084 USD
£1,641 GBP
View
B
Retailer 9
-
$2,508 USD
View
B
Retailer 10
-
$2,711 USD
€2,582 EUR
View
B
Retailer 11
-
$2,958 USD
View
B
Retailer 12
-
$2,975 USD
View
Most Expensive
B
MOH London
LG436074550 · Oct 29
$5,127 USD
£4,037 GBP
View
12 more retailers have this diamond
Prices start from $620 USDSave up to $4,507 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
$620 USD