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Round|Lab Grown|IGI

1.70ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG451056287

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451056287

Diamond specifications and retailer prices

From £918 GBP
$1,230 USD
As of October 28, 2026
Save £2,751 GBP (75%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,669 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.7ct lab-grown round diamond

This 1.7ct 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 LG451056287 or 451056287. Listed at 12 retailers as of October 28, 2026, with prices from £918 to £3,669, a £2,751 spread on the same certified stone. MOH London lists it at £3,669. 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

1.70
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451056287
Dimensions7.57 × 7.62 × 4.72 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.57 mm7.62 mm1.70 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451056287
Side View
Table 57.5%Crown 34.6°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 62.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 28
Current: £3,669 GBP|Low: £782 GBP|High: £3,694 GBP|Avg: £1,677 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
Retailer 14
October 30, 2026
Retailer 8£918 GBP
Retailer 7£979 GBP
Retailer 11£1,066 GBP
Retailer 13£1,096 GBP
Retailer 9£1,136 GBP
Retailer 14£1,136 GBP
Retailer 3£1,265 GBP
Retailer 2£1,491 GBP
Retailer 5£1,570 GBP
Retailer 10£1,797 GBP
Retailer 4£2,117 GBP
Retailer 12£2,129 GBP
Retailer 6£3,250 GBP
MOH London£3,669 GBP

23 data points across 14 retailers

12 retailers£918 GBP to £3,669 GBP

A
Cheapest Retailer
-
£918 GBP
$1,230 USD
A
Retailer 2
-
£979 GBP
$1,312 USD
View
B+
Retailer 3
-
£1,066 GBP
$1,428 USD
View
B+
Retailer 4
-
£1,096 GBP
$1,469 USD
View
Final sale: no returns
B+
Retailer 5
-
£1,136 GBP
$1,522 USD
View
Retailer 6
-
£1,136 GBP
$1,522 USD
View
Price last confirmed 19 days ago
B+
Retailer 7
-
£1,265 GBP
$1,695 USD
View
B+
Retailer 8
-
£1,491 GBP
View
B
Retailer 9
-
£1,797 GBP
$2,408 USD
View
B
Retailer 10
-
£2,117 GBP
$2,837 USD
View
B
Retailer 11
-
£2,129 GBP
$2,853 USD
View
Most Expensive
B
MOH London
LG451056287 · Oct 29
£3,669 GBP
View
11 more retailers have this diamond
Prices start from £918 GBPSave up to £2,751 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
1.70ct Round
£918 GBP