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Emerald|Lab Grown|IGI

20.40ct F VS1 Emerald Lab Grown Diamond

ID • F/VS1 • IGI LG662422475

Shape and cutting style on the report: Emerald cut

Certificate IGI LG662422475

Diamond specifications and retailer prices

From £17,745 GBP
$23,776 USD
As of October 31, 2026
Save £24,687 GBP (58%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £42,432 GBP at Aida Diamonds · As of November 1, 2026
View at Aida Diamonds

About this 20.4ct lab-grown emerald diamond

This 20.4ct lab-grown emerald sits in the over five carat band, graded F colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG662422475 or 662422475. Listed at 16 retailers as of October 31, 2026, with prices from £17,745 to £42,432, a £24,687 spread on the same certified stone. Aida Diamonds lists it at £42,432. 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

20.40
Carat
F
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32°
Pavilion angle32.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG662422475
Dimensions18.68 × 13.41 × 8.44 mm
L/W Ratio1.39
Culet sizeLong
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
18.68 mm13.41 mm20.40 ctF / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG662422475
Side View
Table 60.0%Crown 32°Girdle: MED-STKPavilion 32.5°Culet: LNGDepth 62.9%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £42,432 GBP|Low: £7,923 GBP|High: £63,381 GBP|Avg: £15,755 GBP|+134.4%
Aida 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
Retailer 16
November 1, 2026
Retailer 8£9,573 GBP
Retailer 5£17,745 GBP
Retailer 12£18,955 GBP
Retailer 9£19,587 GBP
Retailer 7£19,743 GBP
Retailer 15£21,293 GBP
Retailer 11£21,819 GBP
Retailer 6£21,937 GBP
Retailer 13£22,385 GBP
Retailer 3£22,721 GBP
Retailer 2£23,311 GBP
Retailer 14£25,148 GBP
Retailer 16£32,995 GBP
Aida Diamonds£42,432 GBP
Retailer 10£50,474 GBP
Retailer 4£63,381 GBP

35 data points across 16 retailers

16 retailers£17,745 GBP to £42,432 GBP

Retailer 1
-
£9,573 GBP
$12,827 USD
Price last confirmed 20 days ago
B
Retailer 2
-
£17,745 GBP
$23,776 USD
View
B
Retailer 3
-
£18,955 GBP
$25,397 USD
View
B
Retailer 4
-
£19,587 GBP
$26,244 USD
View
B
Retailer 5
-
£19,743 GBP
$26,454 USD
View
B
Retailer 6
-
£21,293 GBP
$28,530 USD
View
B
Retailer 7
-
£21,819 GBP
$29,235 USD
View
B
Retailer 8
-
£21,937 GBP
$29,393 USD
View
Final sale: no returns
B
Retailer 9
-
£22,385 GBP
$29,993 USD
View
B
Retailer 10
-
£22,721 GBP
$30,443 USD
View
B
Retailer 11
-
£23,311 GBP
View
Retailer 12
-
£25,148 GBP
$33,695 USD
View
Price under review
Retailer 13
-
£32,995 GBP
$44,210 USD
View
Price under review
Most Expensive
B
Aida Diamonds
497240055 · Nov 1
£42,432 GBP
A$87,468 AUD
View
13 more retailers have this diamond
Prices start from £17,745 GBPSave up to £24,687 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.

B
20.40ct Emerald
£17,745 GBP