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Round|Lab Grown|IGI

1.80ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG497155955

Shape and cutting style on the report: Round brilliant

Certificate IGI LG497155955

Diamond specifications and retailer prices

From £976 GBP
$1,300 USD
As of October 29, 2026
Save £1,289 GBP (57%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,470 GBP at MOH London · As of October 21, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG497155955 or 497155955. Listed at 12 retailers as of October 27, 2026, with a 132% 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
J
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.3°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG497155955
Dimensions7.88 × 7.90 × 4.76 mm
L/W Ratio1.00
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
7.88 mm7.90 mm1.80 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG497155955
Side View
Table 57.5%Crown 33.3°Girdle: THN-MEDPavilion 40.6°Culet: NoneDepth 60.4%

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: Oct 29
Current: £3,470 GBP|Low: £976 GBP|High: £3,498 GBP|Avg: £1,619 GBP|+0.5%
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 7£976 GBP
Retailer 6£1,042 GBP
Retailer 11£1,134 GBP
Retailer 10£1,167 GBP
Retailer 8£1,209 GBP
Retailer 13£1,209 GBP
Retailer 3£1,337 GBP
Retailer 2£1,587 GBP
Retailer 5£1,660 GBP
Retailer 9£1,909 GBP
Retailer 4£2,193 GBP
Retailer 12£2,266 GBP
MOH London£3,470 GBP

24 data points across 13 retailers

12 retailers£976 GBP to £2,266 GBP

A
Cheapest Retailer
-
£976 GBP
$1,300 USD
A
Retailer 2
-
£1,042 GBP
$1,388 USD
View
B+
Retailer 3
-
£1,134 GBP
$1,510 USD
View
B+
Retailer 4
-
£1,167 GBP
$1,554 USD
View
Final sale: no returns
B+
Retailer 5
-
£1,209 GBP
$1,610 USD
View
Retailer 6
-
£1,209 GBP
$1,610 USD
View
Price last confirmed 17 days ago
B+
Retailer 7
-
£1,337 GBP
$1,780 USD
View
B+
Retailer 8
-
£1,587 GBP
View
B
Retailer 9
-
£1,909 GBP
$2,542 USD
View
B
Retailer 10
-
£2,193 GBP
$2,921 USD
View
B
Retailer 11
-
£2,266 GBP
$3,017 USD
View
Most Expensive
MOH London
LG497155955 · Oct 21
£3,470 GBP
View
Price last confirmed 9 days ago
11 more retailers have this diamond
Prices start from £976 GBPSave up to £1,289 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
1.80ct Round
£976 GBP