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Round|Lab Grown|IGI

3.12ct K SI1 Round Lab Grown Diamond

EX • K/SI1 • IGI LG485136526

Shape and cutting style on the report: Round brilliant

Certificate IGI LG485136526

Diamond specifications and retailer prices

From £3,542 GBP
As of November 5, 2026
Save £4,943 GBP (58%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £8,485 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 3.12ct lab-grown round diamond

This 3.12ct lab-grown round sits in the three to five carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG485136526 or 485136526. Listed at 9 retailers as of November 5, 2026, with prices from £3,542 to £8,485, a £4,943 spread on the same certified stone. MOH London lists it at £8,485. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

3.12
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.8°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG485136526
Dimensions9.36 × 9.30 × 5.73 mm
L/W Ratio1.01
Girdle conditionFaceted
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
9.36 mm9.30 mm3.12 ctK / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG485136526
Side View
Table 60.5%Crown 35.8°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.3%

Caratlytics Score

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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: Nov 5
Current: £8,485 GBP|Low: £3,542 GBP|High: £8,622 GBP|Avg: £5,658 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 5, 2026
Retailer 4£3,542 GBP
Retailer 2£4,131 GBP
Retailer 6£4,553 GBP
Retailer 3£5,248 GBP
Retailer 5£6,353 GBP
MOH London£8,485 GBP

18 data points across 6 retailers

9 retailers£3,542 GBP to £8,485 GBP

A
Cheapest Retailer
-
£3,542 GBP
A
Retailer 2
-
£3,712 GBP
View
B+
Retailer 3
-
£4,109 GBP
View
Retailer 4
-
£4,109 GBP
View
Price last confirmed 25 days ago
B+
Retailer 5
-
£4,131 GBP
View
B
Retailer 6
-
£5,134 GBP
View
B
Retailer 7
-
£5,248 GBP
View
B
Retailer 8
-
£6,353 GBP
View
Most Expensive
B
MOH London
LG485136526 · Nov 5
£8,485 GBP
View
8 more retailers have this diamond
Prices start from £3,542 GBPSave up to £4,943 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
3.12ct Round
£3,542 GBP