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Round|Lab Grown|IGI

1.70ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG480150391

Shape and cutting style on the report: Round brilliant

Certificate IGI LG480150391

Diamond specifications and retailer prices

From £716 GBP
$960 USD
As of October 30, 2026
Save £2,953 GBP (80%) 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 LG480150391 or 480150391. Listed at 12 retailers as of October 29, 2026, with prices from £716 to £3,669, a £2,953 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 angle32°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG480150391
Dimensions7.84 × 7.86 × 4.56 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
7.84 mm7.86 mm1.70 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG480150391
Side View
Table 59.0%Crown 32°Girdle: THN-MEDPavilion 40.1°Culet: NoneDepth 58.2%

Caratlytics Score

How it works →
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 30
Current: £3,669 GBP|Low: £716 GBP|High: £3,694 GBP|Avg: £1,542 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 2£716 GBP
Retailer 8£979 GBP
Retailer 12£1,066 GBP
Retailer 11£1,097 GBP
Retailer 3£1,136 GBP
Retailer 9£1,136 GBP
Retailer 7£1,265 GBP
Retailer 6£1,491 GBP
Retailer 5£1,570 GBP
Retailer 10£1,797 GBP
Retailer 4£2,117 GBP
Retailer 13£2,129 GBP
MOH London£3,669 GBP

24 data points across 13 retailers

12 retailers£716 GBP to £3,669 GBP

A
Cheapest Retailer
-
£716 GBP
$960 USD
B+
Retailer 2
-
£979 GBP
$1,312 USD
View
B+
Retailer 3
-
£1,066 GBP
$1,428 USD
View
B+
Retailer 4
-
£1,097 GBP
$1,470 USD
View
Final sale: no returns
Retailer 5
-
£1,136 GBP
$1,522 USD
View
Price last confirmed 18 days ago
B+
Retailer 6
-
£1,136 GBP
$1,522 USD
View
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
LG480150391 · Oct 29
£3,669 GBP
View
11 more retailers have this diamond
Prices start from £716 GBPSave up to £2,953 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
£716 GBP