Marquise|Lab Grown|IGI

1.21ct E SI1 Marquise Lab Grown Diamond

EX • E/SI1 • IGI LG816673640

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG816673640

Diamond specifications and retailer prices

From $188 USD
As of October 30, 2026
Save $791 USD (81%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $979 USD at MOH London · As of October 26, 2026
View at MOH London

About this 1.21ct lab-grown marquise diamond

This 1.21ct lab-grown marquise 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 LG816673640 or 816673640. Listed at 8 retailers as of October 26, 2026, with prices from $188 to $979, a $791 spread on the same certified stone. MOH London lists it at $979. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.3°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816673640
Dimensions11.44 × 5.59 × 3.44 mm
L/W Ratio2.05
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.44 mm5.59 mm1.21 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816673640
Side View
Table 61.0%Crown 33.3°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 61.5%

Caratlytics Score

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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 30
Current: $979 USD|Low: $185 USD|High: $979 USD|Avg: $498 USD|+1.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 31, 2026
Retailer 5$188 USD
Retailer 3$272 USD
Retailer 2$372 USD
Retailer 7$375 USD
Retailer 4$397 USD
Retailer 6$710 USD
Retailer 8$727 USD
MOH London$979 USD

11 data points across 8 retailers

8 retailers$188 USD to $979 USD

A
Cheapest Retailer
-
$188 USD
Final sale: no returns
A
Retailer 2
-
$272 USD
£214 GBP
View
A
Retailer 3
-
$372 USD
£293 GBP
View
A
Retailer 4
-
$375 USD
View
A
Retailer 5
-
$397 USD
View
B
Retailer 6
-
$710 USD
View
B
Retailer 7
-
$727 USD
View
Most Expensive
B
MOH London
LG816673640 · Oct 26
$979 USD
£771 GBP
View
7 more retailers have this diamond
Prices start from $188 USDSave up to $791 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 Marquise
$188 USD