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Princess|Lab Grown|IGI

4.20ct D FL Princess Lab Grown Diamond

ID • D/FL • IGI LG780662054

Shape and cutting style on the report: Princess cut

Certificate IGI LG780662054

Diamond specifications and retailer prices

From £3,944 GBP
$5,284 USD
As of October 30, 2026
Save £23,193 GBP (85%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £27,137 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 4.2ct lab-grown princess diamond

This 4.2ct lab-grown princess sits in the three to five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780662054 or 780662054. Listed at 15 retailers as of October 30, 2026, with prices from £3,944 to £27,137, a £23,193 spread on the same certified stone. Do Amore Diamonds lists it at £27,137. 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

4.20
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.1°
Pavilion angle37.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780662054
Dimensions9.00 × 8.80 × 6.16 mm
L/W Ratio1.02
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
Top View
9.00 mm8.80 mm4.20 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780662054
Side View
Table 66.0%Crown 42.1°Girdle: MED-STKPavilion 37.3°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: £27,137 GBP|Low: £3,944 GBP|High: £32,928 GBP|Avg: £9,464 GBP|-17.6%
Do Amore Diamonds
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 31, 2026
Retailer 11£3,944 GBP
Retailer 9£4,131 GBP
Retailer 2£4,133 GBP
Retailer 12£4,206 GBP
Retailer 13£4,586 GBP
Retailer 8£5,634 GBP
Retailer 4£5,995 GBP
Retailer 7£6,218 GBP
Retailer 5£6,982 GBP
Retailer 6£7,088 GBP
Retailer 14£8,825 GBP
Retailer 10£10,038 GBP
Retailer 15£10,330 GBP
Retailer 3£12,664 GBP
Do Amore Diamonds£27,137 GBP

35 data points across 15 retailers

15 retailers£3,944 GBP to £27,137 GBP

A
Cheapest Retailer
-
£3,944 GBP
$5,284 USD
A
Retailer 2
-
£4,131 GBP
$5,535 USD
View
A
Retailer 3
-
£4,133 GBP
$5,538 USD
View
A
Retailer 4
-
£4,206 GBP
$5,636 USD
View
A
Retailer 5
-
£4,586 GBP
$6,145 USD
View
A
Retailer 6
-
£5,634 GBP
$7,549 USD
View
A
Retailer 7
-
£5,995 GBP
$8,032 USD
View
A
Retailer 8
-
£6,218 GBP
$8,332 USD
View
Final sale: no returns
A
Retailer 9
-
£6,982 GBP
$9,355 USD
View
A
Retailer 10
-
£7,088 GBP
$9,497 USD
View
B+
Retailer 11
-
£8,825 GBP
€11,261 EUR
View
B+
Retailer 12
-
£10,038 GBP
$13,450 USD
View
B+
Retailer 13
-
£10,330 GBP
View
B+
Retailer 14
-
£12,664 GBP
$16,969 USD
View
Most Expensive
B
Do Amore Diamonds
27-1A18A5279 · Oct 31
£27,137 GBP
$36,360 USD
View
14 more retailers have this diamond
Prices start from £3,944 GBPSave up to £23,193 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
4.20ct Princess
£3,944 GBP