Radiant|Lab Grown|IGI

3.51ct D SI1 Radiant Lab Grown Diamond

VG • D/SI1 • IGI LG660405323

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

Certificate IGI LG660405323

Diamond specifications and retailer prices

From $478 USD
As of October 30, 2026
Save $1,713 USD (78%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $2,191 USD at MOH London · As of October 29, 2026
View at MOH London

About this 3.51ct lab-grown radiant diamond

This 3.51ct lab-grown radiant sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG660405323 or 660405323. Listed at 16 retailers as of October 29, 2026, with prices from $478 to $2,191, a $1,713 spread on the same certified stone. MOH London lists it at $2,191. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

3.51
Carat
D
Color
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.9°
Pavilion angle28.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG660405323
Dimensions10.40 × 7.19 × 5.03 mm
L/W Ratio1.45
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
10.40 mm7.19 mm3.51 ctD / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG660405323
Side View
Table 63.0%Crown 42.9°Girdle: MED-STKPavilion 28.7°Culet: NoneDepth 70.0%

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: $2,191 USD|Low: $535 USD|High: $2,205 USD|Avg: $1,267 USD|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 8$535 USD
Retailer 4$735 USD
Retailer 2$811 USD
Retailer 9$907 USD
Retailer 7$926 USD
Retailer 3$985 USD
Retailer 5$1,594 USD
Retailer 10$1,732 USD
Retailer 6$2,082 USD
MOH London$2,191 USD

42 data points across 10 retailers

16 retailers$478 USD to $2,191 USD

A
Cheapest Retailer
-
$478 USD
A
Retailer 2
-
$535 USD
View
Final sale: no returns
A
Retailer 3
-
$536 USD
View
A
Retailer 4
-
$593 USD
View
Retailer 5
-
$593 USD
View
Price last confirmed 14 days ago
A
Retailer 6
-
$735 USD
View
A
Retailer 7
-
$811 USD
£639 GBP
View
B+
Retailer 8
-
$907 USD
View
B+
Retailer 9
-
$926 USD
View
A
Retailer 10
-
$985 USD
£775 GBP
View
B
Retailer 11
-
$1,594 USD
View
B
Retailer 12
-
$1,732 USD
View
B
Retailer 13
-
$1,907 USD
View
B
Retailer 14
-
$1,936 USD
View
B
Retailer 15
-
$2,082 USD
View
Most Expensive
B
MOH London
LG660405323 · Oct 29
$2,191 USD
£1,725 GBP
View
15 more retailers have this diamond
Prices start from $478 USDSave up to $1,713 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
3.51ct Radiant
$478 USD