Radiant|Lab Grown|IGI

5.21ct D FL Radiant Lab Grown Diamond

ID • D/FL • IGI LG784644229

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

Certificate IGI LG784644229

Diamond specifications and retailer prices

From £6,848 GBP

$9,176 USD

As of October 30, 2026

Save £15,287 GBP (69%) vs most expensive(unlock to see where)

15 retailers carry this diamond

Most expensive: £22,135 GBP at Frank Darling · As of October 31, 2026

View at Frank Darling

About this 5.21ct lab-grown radiant diamond

This 5.21ct lab-grown radiant sits in the over five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG784644229 or 784644229. Listed at 15 retailers as of October 30, 2026, with prices from £6,848 to £22,135, a £15,287 spread on the same certified stone. Frank Darling lists it at £22,135. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

5.21

Carat

Colour

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle40.1°

Pavilion angle34.5°

OriginLab Grown

Grading LabIGI

CertificateIGI LG784644229

Dimensions12.05 × 8.70 × 5.77 mm

L/W Ratio1.39

Culet sizePointed

Cert comments

As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II

View IGI Report →View Loupe360 Video →

Top View

OriginLab Grown

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG784644229

Side View

Caratlytics Score

How it works →

A+

Exceptional

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: £22,135 GBP|Low: £6,848 GBP|High: £46,243 GBP|Avg: £13,555 GBP|-12.5%

Frank Darling

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

October 30, 2026

Retailer 10£6,848 GBP

Retailer 12£6,889 GBP

Retailer 6£6,978 GBP

Retailer 4£7,122 GBP

Retailer 15£7,863 GBP

Retailer 3£8,218 GBP

Retailer 13£8,696 GBP

Retailer 9£9,128 GBP

Retailer 11£9,187 GBP

Retailer 7£9,242 GBP

Retailer 2£13,091 GBP

Retailer 8£14,162 GBP

Retailer 5£15,465 GBP

Frank Darling£22,135 GBP

Retailer 14£42,735 GBP

38 data points across 15 retailers

15 retailers£6,848 GBP to £22,135 GBP

A+

Cheapest Retailer

£6,848 GBP

$9,176 USD

Retailer 2

£6,889 GBP

$9,230 USD

View

Retailer 3

£6,978 GBP

$9,350 USD

View

Retailer 4

£7,122 GBP

$9,543 USD

View

Retailer 5

£7,863 GBP

$10,535 USD

View

Retailer 6

£8,218 GBP

$11,011 USD

View

Retailer 7

£8,696 GBP

$11,652 USD

View

Retailer 8

£9,128 GBP

$12,230 USD

View

Retailer 9

£9,187 GBP

$12,310 USD

View

Retailer 10

£9,242 GBP

$12,383 USD

View

Final sale: no returns

Retailer 11

£13,091 GBP

$17,540 USD

View

Retailer 12

£14,162 GBP

View

Retailer 13

£15,465 GBP

€19,735 EUR

View

Price last confirmed 7 days ago

Most Expensive

B+

Frank Darling

P83F-17EL · Oct 31

£22,135 GBP

$29,659 USD

View

13 more retailers have this diamond

Prices start from £6,848 GBPSave up to £15,287 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.

Similar diamonds

A+

5.21ct Radiant

£6,848 GBP