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Round|Lab Grown|IGI

1.80ct K SI2 Round Lab Grown Diamond

EX • K/SI2 • IGI LG451056609

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056609

Diamond specifications and retailer prices

From £1,595 GBP
As of November 5, 2026
Save £1,305 GBP (45%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £5,028 GBP at MOH London · As of October 27, 2026
View at MOH London

About this 1.8ct lab-grown round diamond

This 1.8ct lab-grown round sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451056609 or 451056609. Listed at 8 retailers as of November 4, 2026, with a 82% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.80
Carat
K
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.4°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056609
Dimensions7.98 × 7.99 × 4.64 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.98 mm7.99 mm1.80 ctK / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056609
Side View
Table 60.0%Crown 31.4°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 58.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £5,028 GBP|Low: £1,532 GBP|High: £5,089 GBP|Avg: £2,766 GBP|-0.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 27, 2026
Retailer 3£1,595 GBP
Retailer 6£1,736 GBP
Retailer 4£1,851 GBP
Retailer 8£2,348 GBP
Retailer 7£2,544 GBP
Retailer 5£2,892 GBP
Retailer 2£2,901 GBP
Retailer 9£4,141 GBP
MOH London£5,028 GBP

11 data points across 9 retailers

8 retailers£1,595 GBP to £2,901 GBP

B+
Cheapest Retailer
-
£1,595 GBP
B
Retailer 2
-
£1,736 GBP
View
Retailer 3
-
£1,851 GBP
View
Price last confirmed 26 days ago
B
Retailer 4
-
£1,851 GBP
View
B
Retailer 5
-
£2,544 GBP
View
B
Retailer 6
-
£2,892 GBP
View
B
Retailer 7
-
£2,901 GBP
View
Most Expensive
MOH London
LG451056609 · Oct 27
£5,028 GBP
View
Price last confirmed 10 days ago
7 more retailers have this diamond
Prices start from £1,595 GBPSave up to £1,305 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+
1.80ct Round
£1,595 GBP