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Radiant|Lab Grown|IGI

1.59ct F SI1 Radiant Lab Grown Diamond

ID • F/SI1 • IGI LG610312770

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG610312770

Diamond specifications and retailer prices

From £773 GBP
As of November 5, 2026
Save £41 GBP (5%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £814 GBP at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

About this 1.59ct lab-grown radiant diamond

This 1.59ct lab-grown radiant sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG610312770 or 610312770. Listed at 2 retailers as of November 5, 2026, with a relatively tight 5% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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

1.59
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.4°
Pavilion angle35.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG610312770
Dimensions8.39 × 5.68 × 3.88 mm
L/W Ratio1.48
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
8.39 mm5.68 mm1.59 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG610312770
Side View
Table 65.0%Crown 44.4°Girdle: MediumPavilion 35.4°Culet: NoneDepth 68.3%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 5
Current: £814 GBP|Low: £108 GBP|High: £1,307 GBP|Avg: £615 GBP|-31.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
August 27, 2026
Retailer 4£108 GBP
Retailer 3£279 GBP
Retailer 7£323 GBP
Retailer 8£403 GBP
Retailer 10£475 GBP
Retailer 6£510 GBP
Retailer 5£512 GBP
Retailer 9£622 GBP
Brilliant Earth£814 GBP
Retailer 2£1,307 GBP

66 data points across 10 retailers

2 retailers£773 GBP to £814 GBP

B
Cheapest Retailer
-
£773 GBP
Most Expensive
B
Brilliant Earth
8682830Y · Nov 6
£814 GBP
$1,090 USD
View
1 more retailer has this diamond
Prices start from £773 GBPSave up to £41 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
1.59ct Radiant
£773 GBP