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Heart|Lab Grown|IGI

20.50ct G VS1 Heart Lab Grown Diamond

ID • G/VS1 • IGI LG843673757

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG843673757

Diamond specifications and retailer prices

From £6,971 GBP
As of November 2, 2026
Save £19,895 GBP (74%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £26,866 GBP at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

About this 20.5ct lab-grown heart diamond

This 20.5ct lab-grown heart sits in the over five carat band, graded G colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG843673757 or 843673757. Listed at 14 retailers as of October 31, 2026, with prices from £6,971 to £26,866, a £19,895 spread on the same certified stone. Taylor and Hart lists it at £26,866. 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

20.50
Carat
G
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle38.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG843673757
Dimensions16.79 × 18.97 × 11.17 mm
L/W Ratio1.13
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
16.79 mm18.97 mm20.50 ctG / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG843673757
Side View
Table 55.0%Crown 34.9°Girdle: MED-STKPavilion 38.6°Culet: NoneDepth 58.9%

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: Nov 2
Current: £9,266 GBP|Low: £6,969 GBP|High: £26,866 GBP|Avg: £12,407 GBP|+8.1%
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
Taylor and Hart
November 2, 2026
Retailer 6£6,971 GBP
Retailer 10£7,484 GBP
Retailer 12£7,783 GBP
Retailer 5£8,027 GBP
Retailer 3£8,135 GBP
Retailer 13£8,579 GBP
Retailer 4£8,680 GBP
Retailer 1£9,266 GBP
Retailer 9£9,354 GBP
Retailer 8£10,238 GBP
Retailer 7£16,420 GBP
Retailer 11£19,346 GBP
Retailer 2£24,831 GBP
Taylor and Hart£26,866 GBP

15 data points across 14 retailers

14 retailers£6,971 GBP to £26,866 GBP

A
Cheapest Retailer
-
£6,971 GBP
A
Retailer 2
-
£7,484 GBP
$10,036 USD
View
B+
Retailer 3
-
£7,783 GBP
$10,437 USD
View
B+
Retailer 4
-
£8,027 GBP
$10,765 USD
View
B+
Retailer 5
-
£8,135 GBP
$10,910 USD
View
B+
Retailer 6
-
£8,579 GBP
$11,505 USD
View
B+
Retailer 7
-
£8,680 GBP
$11,641 USD
View
B+
Retailer 8
-
£9,266 GBP
$12,426 USD
View
B+
Retailer 9
-
£9,354 GBP
$12,544 USD
View
B+
Retailer 10
-
£10,238 GBP
View
B
Retailer 11
-
£16,420 GBP
A$33,877 AUD
View
B
Retailer 12
-
£19,346 GBP
$25,945 USD
View
B
Retailer 13
-
£24,831 GBP
$33,300 USD
View
Most Expensive
B
Taylor and Hart
TGOWP9E · Oct 31
£26,866 GBP
$36,030 USD
View
13 more retailers have this diamond
Prices start from £6,971 GBPSave up to £19,895 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
20.50ct Heart
£6,971 GBP