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Round|Lab Grown|IGI

1.21ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG567369590

Shape and cutting style on the report: Round brilliant

Certificate IGI LG567369590

Diamond specifications and retailer prices

From $165 USD
As of November 1, 2026
Save $793 USD (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $958 USD at MOH London · As of October 26, 2026
View at MOH London

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG567369590 or 567369590. Listed at 17 retailers as of October 26, 2026, with prices from $165 to $958, a $793 spread on the same certified stone. MOH London lists it at $958. 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

1.21
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG567369590
Dimensions6.85 × 6.81 × 4.23 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
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
6.85 mm6.81 mm1.21 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG567369590
Side View
Table 57.5%Crown 35.3°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.0%

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 1
Current: $958 USD|Low: $158 USD|High: $968 USD|Avg: $412 USD
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
November 1, 2026
Retailer 10$165 USD
Retailer 5$184 USD
Retailer 3$191 USD
Retailer 11$205 USD
Retailer 12$280 USD
Retailer 7$354 USD
Retailer 6$362 USD
Retailer 2$398 USD
Retailer 13$454 USD
Retailer 4$658 USD
Retailer 8$674 USD
Retailer 9$695 USD
MOH London$958 USD

45 data points across 13 retailers

17 retailers$165 USD to $958 USD

A
Cheapest Retailer
-
$165 USD
A
Retailer 2
-
$184 USD
View
Final sale: no returns
A
Retailer 3
-
$191 USD
View
A
Retailer 4
-
$205 USD
View
Retailer 5
-
$205 USD
View
Price last confirmed 7 days ago
A
Retailer 6
-
$230 USD
HK$1,800 HKD
View
B+
Retailer 7
-
$280 USD
View
A
Retailer 8
-
$354 USD
€337 EUR
View
A
Retailer 9
-
$362 USD
£285 GBP
View
A
Retailer 10
-
$371 USD
View
A
Retailer 11
-
$398 USD
£314 GBP
View
Retailer 12
-
$450 USD
View
Price last confirmed 42 days ago
B+
Retailer 13
-
$454 USD
View
B
Retailer 14
-
$658 USD
View
B
Retailer 15
-
$674 USD
SGD 911 SGD
View
B
Retailer 16
-
$695 USD
View
Most Expensive
B
MOH London
LG567369590 · Oct 26
$958 USD
£754 GBP
View
16 more retailers have this diamond
Prices start from $165 USDSave up to $793 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
1.21ct Round
$165 USD