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Radiant|Lab Grown|IGI

3.09ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • IGI LG710539520

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG710539520

Diamond specifications and retailer prices

From $355 USD
As of October 30, 2026
Save $4,485 USD (93%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $4,840 USD at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 3.09ct lab-grown radiant diamond

This 3.09ct lab-grown radiant sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG710539520 or 710539520. Listed at 19 retailers as of October 29, 2026, with prices from $355 to $4,840, a $4,485 spread on the same certified stone. Brilliant Earth lists it at $4,840. 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

3.09
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.1°
Pavilion angle36.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG710539520
Dimensions10.16 × 7.19 × 4.99 mm
L/W Ratio1.41
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.16 mm7.19 mm3.09 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG710539520
Side View
Table 67.0%Crown 43.1°Girdle: MED-STKPavilion 36.2°Culet: NoneDepth 69.4%

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: $4,840 USD|Low: $331 USD|High: $4,840 USD|Avg: $1,185 USD
Brilliant Earth
Retailer 2
Retailer 3
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Retailer 5
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Retailer 7
Retailer 8
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Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
October 30, 2026
Retailer 2$355 USD
Retailer 10$396 USD
Retailer 5$411 USD
Retailer 6$440 USD
Retailer 14$440 USD
Retailer 4$590 USD
Retailer 17$590 USD
Retailer 12$601 USD
Retailer 7$757 USD
Retailer 18$770 USD
Retailer 13$791 USD
Retailer 3$1,289 USD
Retailer 16$1,413 USD
Retailer 11$1,454 USD
Retailer 9$1,556 USD
Retailer 8$1,687 USD
Retailer 15$1,727 USD
Retailer 19$2,495 USD
Brilliant Earth$4,840 USD

33 data points across 19 retailers

19 retailers$355 USD to $4,840 USD

A
Cheapest Retailer
-
$355 USD
A
Retailer 2
-
$396 USD
View
Final sale: no returns
A
Retailer 3
-
$411 USD
View
A
Retailer 4
-
$440 USD
View
A
Retailer 5
-
$440 USD
View
B+
Retailer 6
-
$590 USD
View
A
Retailer 7
-
$590 USD
View
A
Retailer 8
-
$601 USD
£473 GBP
View
A
Retailer 9
-
$757 USD
View
A
Retailer 10
-
$770 USD
€733 EUR
View
A
Retailer 11
-
$791 USD
£623 GBP
View
B
Retailer 12
-
$1,289 USD
View
B+
Retailer 13
-
$1,413 USD
View
B+
Retailer 14
-
$1,454 USD
View
B+
Retailer 15
-
$1,556 USD
View
B
Retailer 16
-
$1,687 USD
View
B+
Retailer 17
-
$1,727 USD
£1,360 GBP
View
B
Retailer 18
-
$2,495 USD
View
Most Expensive
B
Brilliant Earth
16226177A · Oct 29
$4,840 USD
View
18 more retailers have this diamond
Prices start from $355 USDSave up to $4,485 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
3.09ct Radiant
$355 USD