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Marquise|Lab Grown|IGI

1.21ct E SI1 Marquise Lab Grown Diamond

EX • E/SI1 • IGI LG809666006

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG809666006

Diamond specifications and retailer prices

From €689 EUR
$770 USD
As of October 31, 2026
1 retailer carries this diamond
Only listing: €689 EUR at Brilliant Earth
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Brilliant Earth

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 LG809666006 or 809666006. Listed at a single retailer as of October 31, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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 angle36.6°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG809666006
Dimensions10.46 × 5.65 × 3.49 mm
L/W Ratio1.85
Girdle conditionFaceted
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
10.46 mm5.65 mm1.21 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG809666006
Side View
Table 62.0%Crown 36.6°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 61.8%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 31
Current: €689 EUR|Low: €116 EUR|High: €689 EUR|Avg: €422 EUR
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
July 6, 2026
Retailer 6€116 EUR
Retailer 3€290 EUR
Retailer 5€294 EUR
Retailer 8€305 EUR
Retailer 7€439 EUR
Retailer 4€477 EUR
Retailer 2€586 EUR
Retailer 9€606 EUR
Brilliant Earth€689 EUR

12 data points across 9 retailers

1 retailer

B
Brilliant Earth
20268713A · Oct 31
€689 EUR
$770 USD
View

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.

B
1.21ct Marquise
€689 EUR