Round|Lab Grown|IGI

3.09ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG678518609

Shape and cutting style on the report: Round brilliant

Certificate IGI LG678518609

Diamond specifications and retailer prices

From $1,136 USD
As of November 6, 2026
6 retailers carry this diamond
Most expensive: $1,840 USD at Rare Carat · As of September 9, 2026
View at Rare Carat

About this 3.09ct lab-grown round diamond

This 3.09ct lab-grown round sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG678518609 or 678518609. Listed at 6 retailers as of November 6, 2026. 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
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.7°
Pavilion angle40.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG678518609
Dimensions9.41 × 9.36 × 5.67 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.41 mm9.36 mm3.09 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG678518609
Side View
Table 59.0%Crown 34.7°Girdle: MED-STKPavilion 40.4°Culet: NoneDepth 60.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 6
Current: $1,840 USD|Low: $302 USD|High: $2,220 USD|Avg: $973 USD
Rare Carat
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
Retailer 15
Retailer 16
Retailer 17
October 21, 2026
Retailer 17$378 USD
Retailer 12$423 USD
Retailer 15$423 USD
Retailer 5$462 USD
Retailer 7$469 USD
Retailer 4$630 USD
Retailer 6$730 USD
Retailer 10$735 USD
Retailer 13$813 USD
Retailer 14$852 USD
Retailer 9$977 USD
Retailer 16$1,075 USD
Retailer 2$1,136 USD
Retailer 3$1,506 USD
Rare Carat$1,840 USD
Retailer 11$1,850 USD
Retailer 8$2,220 USD

8 data points across 17 retailers

6 retailers

Retailer 1
-
$378 USD
Price last confirmed 44 days ago
Retailer 2
-
$423 USD
View
Price last confirmed 44 days ago
Retailer 3
-
$462 USD
View
Price last confirmed 45 days ago
B+
Retailer 4
-
$1,136 USD
View
Retailer 5
-
$1,506 USD
View
Price last confirmed 46 days ago
Most Expensive
Rare Carat
KL6095186CC678 · Sep 9
$1,840 USD
View
Price last confirmed 57 days ago
5 more retailers have this diamond
Prices start from $1,136 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.

B+
3.09ct Round
$1,136 USD