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Marquise|Lab Grown|IGI

1.21ct D IF Marquise Lab Grown Diamond

ID • D/IF • IGI LG850604471

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG850604471

Diamond specifications and retailer prices

From $339 USD
As of November 4, 2026
Save $1,451 USD (81%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $1,790 USD at Brilliant Earth · As of November 6, 2026
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 D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG850604471 or 850604471. Listed at 20 retailers as of November 6, 2026, with prices from $339 to $1,790, a $1,451 spread on the same certified stone. Brilliant Earth lists it at $1,790. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
D
Color
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle39.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG850604471
Dimensions10.90 × 5.55 × 3.48 mm
L/W Ratio1.96
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
10.90 mm5.55 mm1.21 ctD / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG850604471
Side View
Table 61.0%Crown 36.1°Girdle: MED-STKPavilion 39.7°Culet: NoneDepth 62.7%

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 4
Current: $682 USD|Low: $407 USD|High: $1,680 USD|Avg: $963 USD
Retailer 1
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
November 6, 2026
Retailer 12$407 USD
Retailer 7$430 USD
Retailer 14$486 USD
Retailer 10$575 USD
Retailer 3$595 USD
Retailer 1$682 USD
Retailer 9$746 USD
Retailer 11$799 USD
Retailer 6$958 USD
Retailer 2$1,394 USD
Retailer 4$1,412 USD
Retailer 5$1,607 USD
Retailer 8$1,637 USD
Retailer 13$1,680 USD

4 data points across 14 retailers

20 retailers$339 USD to $1,790 USD

A
Cheapest Retailer
-
$339 USD
Retailer 2
-
$339 USD
View
Retailer 3
-
$393 USD
View
A
Retailer 4
-
$407 USD
View
Final sale: no returns
A
Retailer 5
-
$430 USD
View
A
Retailer 6
-
$486 USD
View
A
Retailer 7
-
$575 USD
View
A
Retailer 8
-
$595 USD
View
A
Retailer 9
-
$682 USD
View
B+
Retailer 10
-
$746 USD
View
B+
Retailer 11
-
$799 USD
View
B+
Retailer 12
-
$958 USD
View
B
Retailer 13
-
$1,351 USD
View
Retailer 14
-
$1,351 USD
View
B
Retailer 15
-
$1,394 USD
View
B
Retailer 16
-
$1,412 USD
View
B
Retailer 17
-
$1,607 USD
View
B
Retailer 18
-
$1,637 USD
View
B
Retailer 19
-
$1,680 USD
View
Most Expensive
B
Brilliant Earth
22500660A · Nov 6
$1,790 USD
View
19 more retailers have this diamond
Prices start from $339 USDSave up to $1,451 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
$339 USD