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Heart|Lab Grown|IGI

20.51ct G VS1 Heart Lab Grown Diamond

VG • G/VS1 • IGI LG720595533

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG720595533

Diamond specifications and retailer prices

From £8,809 GBP
$11,814 USD
As of November 2, 2026
Save £21,025 GBP (70%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £29,835 GBP at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

About this 20.51ct lab-grown heart diamond

This 20.51ct lab-grown heart sits in the over five carat band, graded G colour (near-colourless) and VS1 clarity (very-slightly-included), with a very-good cut grade and certified by IGI LG720595533 or 720595533. Listed at 14 retailers as of October 31, 2026, with prices from £8,809 to £29,835, a £21,025 spread on the same certified stone. Taylor and Hart lists it at £29,835. 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

20.51
Carat
G
Colour
VS1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.8°
Pavilion angle38.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG720595533
Dimensions16.59 × 17.88 × 10.68 mm
L/W Ratio1.08
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
16.59 mm17.88 mm20.51 ctG / VS1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG720595533
Side View
Table 66.0%Crown 41.8°Girdle: VTK-ETKPavilion 38.5°Culet: NoneDepth 59.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £19,271 GBP|Low: £8,457 GBP|High: £29,835 GBP|Avg: £13,166 GBP|-0.2%
Retailer 1
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
Taylor and Hart
November 1, 2026
Retailer 10£8,809 GBP
Retailer 14£9,162 GBP
Retailer 3£9,312 GBP
Retailer 13£9,577 GBP
Retailer 4£9,866 GBP
Retailer 7£10,074 GBP
Retailer 2£10,219 GBP
Retailer 11£10,219 GBP
Retailer 9£10,843 GBP
Retailer 12£10,898 GBP
Retailer 6£11,834 GBP
Retailer 8£12,322 GBP
Retailer 1£19,271 GBP
Retailer 5£19,809 GBP
Taylor and Hart£29,835 GBP

16 data points across 15 retailers

14 retailers£8,809 GBP to £29,835 GBP

B+
Cheapest Retailer
-
£8,809 GBP
$11,814 USD
B+
Retailer 2
-
£9,162 GBP
$12,287 USD
View
B+
Retailer 3
-
£9,312 GBP
$12,488 USD
View
B+
Retailer 4
-
£9,577 GBP
$12,844 USD
View
B+
Retailer 5
-
£9,866 GBP
$13,231 USD
View
Final sale: no returns
B
Retailer 6
-
£10,074 GBP
$13,510 USD
View
B+
Retailer 7
-
£10,219 GBP
$13,705 USD
View
Retailer 8
-
£10,219 GBP
$13,705 USD
View
Price last confirmed 22 days ago
B
Retailer 9
-
£10,843 GBP
$14,541 USD
View
B
Retailer 10
-
£10,898 GBP
$14,615 USD
View
Retailer 11
-
£12,322 GBP
View
Price last confirmed 14 days ago
B
Retailer 12
-
£19,271 GBP
A$39,759 AUD
View
B
Retailer 13
-
£19,809 GBP
$26,566 USD
View
Most Expensive
B
Taylor and Hart
GW5JPQB · Oct 31
£29,835 GBP
$40,011 USD
View
13 more retailers have this diamond
Prices start from £8,809 GBPSave up to £21,025 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+
20.51ct Heart
£8,809 GBP