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Round|Lab Grown|IGI

1.21ct I SI1 Round Lab Grown Diamond

VG • I/SI1 • IGI LG843641795

Shape and cutting style on the report: Round brilliant

Certificate IGI LG843641795

Diamond specifications and retailer prices

From £194 GBP
As of October 30, 2026
Save £317 GBP (62%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £830 GBP at MOH London · As of October 25, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG843641795 or 843641795. Listed at 14 retailers as of October 30, 2026, with a 164% 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

1.21
Carat
I
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle35.5°
Pavilion angle39.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG843641795
Dimensions6.90 × 6.87 × 4.11 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.90 mm6.87 mm1.21 ctI / SI1
OriginLab Grown
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG843641795
Side View
Table 59.0%Crown 35.5°Girdle: MediumPavilion 39.8°Culet: NoneDepth 59.8%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £830 GBP|Low: £143 GBP|High: £851 GBP|Avg: £394 GBP|-0.3%
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
Retailer 14
Retailer 15
November 6, 2026
Retailer 6£167 GBP
Retailer 3£187 GBP
Retailer 12£194 GBP
Retailer 15£207 GBP
Retailer 8£253 GBP
Retailer 14£281 GBP
Retailer 9£312 GBP
Retailer 2£340 GBP
Retailer 13£401 GBP
Retailer 11£492 GBP
Retailer 5£494 GBP
Retailer 10£511 GBP
Retailer 7£570 GBP
Retailer 4£706 GBP
MOH London£830 GBP

14 data points across 15 retailers

14 retailers£194 GBP to £511 GBP

Retailer 1
-
£167 GBP
Price last confirmed 11 days ago
B+
Retailer 2
-
£194 GBP
View
Retailer 3
-
£207 GBP
View
Price last confirmed 10 days ago
B+
Retailer 4
-
£253 GBP
View
B+
Retailer 5
-
£281 GBP
View
B+
Retailer 6
-
£312 GBP
View
B+
Retailer 7
-
£340 GBP
View
B+
Retailer 8
-
£401 GBP
View
B+
Retailer 9
-
£492 GBP
View
Retailer 10
-
£494 GBP
View
Price last confirmed 11 days ago
B+
Retailer 11
-
£511 GBP
View
Retailer 12
-
£570 GBP
View
Price last confirmed 13 days ago
Retailer 13
-
£706 GBP
View
Price last confirmed 10 days ago
Most Expensive
MOH London
LG843641795 · Oct 25
£830 GBP
View
Price last confirmed 12 days ago
13 more retailers have this diamond
Prices start from £194 GBPSave up to £317 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+
1.21ct Round
£194 GBP