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Round|Lab Grown|IGI

1.21ct J VS1 Round Lab Grown Diamond

EX • J/VS1 • IGI LG480171498

Shape and cutting style on the report: Round brilliant

Certificate IGI LG480171498

Diamond specifications and retailer prices

From £515 GBP
$690 USD
As of October 30, 2026
Save £3,022 GBP (85%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,537 GBP at MOH London · As of October 27, 2026
View at MOH London

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded J colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG480171498 or 480171498. Listed at 12 retailers as of October 27, 2026, with prices from £515 to £3,537, a £3,022 spread on the same certified stone. MOH London lists it at £3,537. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
J
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle31.5°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG480171498
Dimensions6.97 × 6.93 × 4.16 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
6.97 mm6.93 mm1.21 ctJ / VS1
OriginLab Grown
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateIGI LG480171498
Side View
Table 55.0%Crown 31.5°Girdle: MediumPavilion 40.5°Culet: NoneDepth 59.9%

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: £3,537 GBP|Low: £515 GBP|High: £3,580 GBP|Avg: £1,764 GBP|+0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 30, 2026
Retailer 2£515 GBP
Retailer 7£948 GBP
Retailer 11£1,061 GBP
Retailer 8£1,099 GBP
Retailer 10£1,099 GBP
Retailer 12£1,228 GBP
Retailer 13£1,511 GBP
Retailer 9£1,741 GBP
Retailer 6£2,021 GBP
Retailer 3£2,049 GBP
Retailer 5£2,461 GBP
Retailer 4£3,149 GBP
MOH London£3,537 GBP

21 data points across 13 retailers

12 retailers£515 GBP to £3,537 GBP

A
Cheapest Retailer
-
£515 GBP
$690 USD
B+
Retailer 2
-
£948 GBP
$1,270 USD
View
B+
Retailer 3
-
£1,031 GBP
$1,382 USD
View
B+
Retailer 4
-
£1,061 GBP
$1,422 USD
View
Final sale: no returns
Retailer 5
-
£1,099 GBP
$1,473 USD
View
Price last confirmed 18 days ago
B
Retailer 6
-
£1,099 GBP
$1,473 USD
View
B+
Retailer 7
-
£1,228 GBP
$1,645 USD
View
B
Retailer 8
-
£1,741 GBP
$2,333 USD
View
B
Retailer 9
-
£2,021 GBP
ZAR 43,754 ZAR
View
B
Retailer 10
-
£2,049 GBP
$2,746 USD
View
B
Retailer 11
-
£2,061 GBP
$2,762 USD
View
Most Expensive
B
MOH London
LG480171498 · Oct 27
£3,537 GBP
View
11 more retailers have this diamond
Prices start from £515 GBPSave up to £3,022 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
1.21ct Round
£515 GBP