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Emerald|Lab Grown|IGI

20.57ct F VS1 Emerald Lab Grown Diamond

VG • F/VS1 • IGI LG826662775

Shape and cutting style on the report: Emerald cut

Certificate IGI LG826662775

Diamond specifications and retailer prices

From £9,318 GBP
$12,485 USD
As of November 2, 2026
Save £10,326 GBP (53%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £30,275 GBP at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

About this 20.57ct lab-grown emerald diamond

This 20.57ct lab-grown emerald sits in the over five carat band, graded F colour (colourless) and VS1 clarity (very-slightly-included), with a very-good cut grade and certified by IGI LG826662775 or 826662775. Listed at 9 retailers as of November 1, 2026, with a 111% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

20.57
Carat
F
Colour
VS1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.9°
Pavilion angle39.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG826662775
Dimensions19.48 × 12.92 × 8.13 mm
L/W Ratio1.51
Culet sizeLarge
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
19.48 mm12.92 mm20.57 ctF / VS1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG826662775
Side View
Table 66.0%Crown 33.9°Girdle: MediumPavilion 39.6°Culet: LargeDepth 62.9%

Caratlytics Score

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

Price History

Last verified: Nov 2
Current: £19,644 GBP|Low: £6,575 GBP|High: £43,959 GBP|Avg: £16,103 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Taylor and Hart
November 1, 2026
Retailer 7£6,575 GBP
Retailer 4£9,318 GBP
Retailer 6£9,613 GBP
Retailer 5£10,173 GBP
Retailer 3£12,186 GBP
Retailer 8£16,627 GBP
Retailer 1£19,644 GBP
Taylor and Hart£30,275 GBP
Retailer 2£36,458 GBP

28 data points across 9 retailers

9 retailers£9,318 GBP to £19,644 GBP

Retailer 1
-
£6,575 GBP
$8,810 USD
Price last confirmed 11 days ago
B
Retailer 2
-
£9,318 GBP
$12,485 USD
View
B
Retailer 3
-
£9,613 GBP
$12,881 USD
View
B
Retailer 4
-
£10,173 GBP
$13,631 USD
View
B
Retailer 5
-
£12,186 GBP
View
B
Retailer 6
-
£16,627 GBP
$22,279 USD
View
B
Retailer 7
-
£19,644 GBP
A$40,493 AUD
View
Most Expensive
Taylor and Hart
XKAONNY · Oct 31
£30,275 GBP
$40,565 USD
View
Price under review
7 more retailers have this diamond
Prices start from £9,318 GBPSave up to £10,326 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
20.57ct Emerald
£9,318 GBP