CaratHunter
Plans
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 £357 GBP
$478 USD
As of October 30, 2026
Save £1,278 GBP (78%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,635 GBP 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 £357 to £1,635, a £1,278 spread on the same certified stone. MOH London lists it at £1,635. 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
Colour
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

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £1,635 GBP|Low: £343 GBP|High: £1,645 GBP|Avg: £819 GBP|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 31, 2026
Retailer 9£357 GBP
Retailer 3£399 GBP
Retailer 4£400 GBP
Retailer 10£443 GBP
Retailer 7£549 GBP
Retailer 6£605 GBP
Retailer 5£677 GBP
Retailer 13£691 GBP
Retailer 2£735 GBP
Retailer 8£1,190 GBP
Retailer 12£1,423 GBP
Retailer 11£1,554 GBP
MOH London£1,635 GBP

43 data points across 13 retailers

16 retailers£357 GBP to £1,635 GBP

A
Cheapest Retailer
-
£357 GBP
$478 USD
A
Retailer 2
-
£399 GBP
$535 USD
View
Final sale: no returns
A
Retailer 3
-
£400 GBP
$536 USD
View
A
Retailer 4
-
£443 GBP
$593 USD
View
Retailer 5
-
£443 GBP
$593 USD
View
Price last confirmed 14 days ago
A
Retailer 6
-
£549 GBP
$735 USD
View
A
Retailer 7
-
£605 GBP
View
B+
Retailer 8
-
£677 GBP
$907 USD
View
B+
Retailer 9
-
£691 GBP
$926 USD
View
A
Retailer 10
-
£735 GBP
View
B
Retailer 11
-
£1,190 GBP
$1,594 USD
View
B
Retailer 12
-
£1,293 GBP
$1,732 USD
View
B
Retailer 13
-
£1,423 GBP
$1,907 USD
View
B
Retailer 14
-
£1,445 GBP
$1,936 USD
View
B
Retailer 15
-
£1,554 GBP
$2,082 USD
View
Most Expensive
B
MOH London
LG660405323 · Oct 29
£1,635 GBP
View
15 more retailers have this diamond
Prices start from £357 GBPSave up to £1,278 GBP

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
£357 GBP