Radiant|Lab Grown|IGI

3.15ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG818602709

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

Certificate IGI LG818602709

Diamond specifications and retailer prices

From $982 USD
As of October 29, 2026
Save $2,726 USD (74%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $3,708 USD at Diamonds Direct · As of October 30, 2026
View at Diamonds Direct

About this 3.15ct lab-grown radiant diamond

This 3.15ct lab-grown radiant sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG818602709 or 818602709. Listed at 5 retailers as of October 29, 2026, with prices from $982 to $3,708, a $2,726 spread on the same certified stone. Diamonds Direct lists it at $3,708. 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

3.15
Carat
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.2°
Pavilion angle35.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818602709
Dimensions9.95 × 7.24 × 5.02 mm
L/W Ratio1.37
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.95 mm7.24 mm3.15 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818602709
Side View
Table 63.0%Crown 43.2°Girdle: Slightly ThickPavilion 35.4°Culet: NoneDepth 69.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 29
Current: $3,708 USD|Low: $946 USD|High: $3,708 USD|Avg: $1,917 USD
Diamonds Direct
Retailer 2
Retailer 3
Retailer 4
Retailer 5
October 30, 2026
Retailer 4$982 USD
Retailer 2$1,046 USD
Retailer 5$1,744 USD
Retailer 3$2,085 USD
Diamonds Direct$3,708 USD

20 data points across 5 retailers

5 retailers$982 USD to $3,708 USD

A
Cheapest Retailer
-
$982 USD
A
Retailer 2
-
$1,046 USD
£824 GBP
View
B
Retailer 3
-
$1,744 USD
View
B
Retailer 4
-
$2,085 USD
View
Most Expensive
B
Diamonds Direct
1046581 · Oct 30
$3,708 USD
View
4 more retailers have this diamond
Prices start from $982 USDSave up to $2,726 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
3.15ct Radiant
$982 USD