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Round|Lab Grown|IGI

21.16ct G VS1 Round Lab Grown Diamond

ID • G/VS1 • IGI LG724557816

Shape and cutting style on the report: Round brilliant

Certificate IGI LG724557816

Diamond specifications and retailer prices

From £7,886 GBP
As of October 30, 2026
Save £23,490 GBP (75%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £31,376 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 21.16ct lab-grown round diamond

This 21.16ct lab-grown round 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 LG724557816 or 724557816. Listed at 18 retailers as of October 30, 2026, with prices from £7,886 to £31,376, a £23,490 spread on the same certified stone. Brilliant Earth lists it at £31,376. 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

21.16
Carat
G
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.9°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG724557816
Dimensions17.91 × 17.87 × 10.84 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
17.91 mm17.87 mm21.16 ctG / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG724557816
Side View
Table 58.0%Crown 33.9°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 60.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £31,376 GBP|Low: £7,860 GBP|High: £32,256 GBP|Avg: £15,195 GBP|-2.7%
Brilliant Earth
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
Retailer 17
October 31, 2026
Retailer 11£7,886 GBP
Retailer 16£9,114 GBP
Retailer 14£9,150 GBP
Retailer 8£9,479 GBP
Retailer 6£9,627 GBP
Retailer 5£9,908 GBP
Retailer 4£10,573 GBP
Retailer 9£10,573 GBP
Retailer 12£10,575 GBP
Retailer 15£11,217 GBP
Retailer 3£11,274 GBP
Retailer 10£12,305 GBP
Retailer 2£17,728 GBP
Retailer 13£19,959 GBP
Retailer 17£22,263 GBP
Retailer 7£30,602 GBP
Brilliant Earth£31,376 GBP

36 data points across 17 retailers

18 retailers£7,886 GBP to £31,376 GBP

A
Cheapest Retailer
-
£7,886 GBP
B+
Retailer 2
-
£9,114 GBP
$12,212 USD
View
Retailer 3
-
£9,150 GBP
$12,260 USD
View
Price last confirmed 13 days ago
B+
Retailer 4
-
£9,479 GBP
$12,701 USD
View
B+
Retailer 5
-
£9,627 GBP
$12,899 USD
View
B+
Retailer 6
-
£9,908 GBP
$13,276 USD
View
B+
Retailer 7
-
£10,573 GBP
$14,166 USD
View
Retailer 8
-
£10,573 GBP
$14,166 USD
View
Price last confirmed 19 days ago
B+
Retailer 9
-
£10,575 GBP
$14,170 USD
View
B+
Retailer 10
-
£11,217 GBP
$15,030 USD
View
B+
Retailer 11
-
£11,274 GBP
$15,106 USD
View
B+
Retailer 12
-
£12,305 GBP
View
B
Retailer 13
-
£15,224 GBP
$20,398 USD
View
Final sale: no returns
B
Retailer 14
-
£17,728 GBP
€22,623 EUR
View
Retailer 15
-
£19,959 GBP
A$41,143 AUD
View
Price last confirmed 9 days ago
B
Retailer 16
-
£22,263 GBP
$29,830 USD
View
B
Retailer 17
-
£30,602 GBP
$41,004 USD
View
Most Expensive
B
Brilliant Earth
15459111A · Oct 31
£31,376 GBP
$42,040 USD
View
17 more retailers have this diamond
Prices start from £7,886 GBPSave up to £23,490 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
21.16ct Round
£7,886 GBP