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Radiant|Lab Grown|IGI

1.59ct D SI1 Radiant Lab Grown Diamond

EX • D/SI1 • IGI LG739595146

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

Certificate IGI LG739595146

Diamond specifications and retailer prices

From £136 GBP
$182 USD
As of November 2, 2026
Save £833 GBP (86%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £969 GBP at Brilliant Earth · As of October 31, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG739595146 or 739595146. Listed at 17 retailers as of October 31, 2026, with prices from £136 to £969, a £833 spread on the same certified stone. Brilliant Earth lists it at £969. 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45.7°
Pavilion angle36°
OriginLab Grown
Grading LabIGI
CertificateIGI LG739595146
Dimensions7.95 × 5.86 × 3.95 mm
L/W Ratio1.36
Culet sizePointed
Top View
7.95 mm5.86 mm1.59 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG739595146
Side View
Table 65.0%Crown 45.7°Girdle: MediumPavilion 36°Culet: NoneDepth 67.4%

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: Nov 2
Current: £969 GBP|Low: £130 GBP|High: £999 GBP|Avg: £408 GBP|-3.0%
Brilliant Earth
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
November 2, 2026
Retailer 10£136 GBP
Retailer 14£157 GBP
Retailer 3£168 GBP
Retailer 11£168 GBP
Retailer 6£227 GBP
Retailer 8£284 GBP
Retailer 2£303 GBP
Retailer 5£334 GBP
Retailer 4£364 GBP
Retailer 9£424 GBP
Retailer 12£540 GBP
Retailer 13£775 GBP
Retailer 7£785 GBP
Brilliant Earth£969 GBP

45 data points across 14 retailers

17 retailers£136 GBP to £969 GBP

A
Cheapest Retailer
-
£136 GBP
$182 USD
A
Retailer 2
-
£157 GBP
$211 USD
View
Retailer 3
-
£168 GBP
$225 USD
View
Price last confirmed 8 days ago
A
Retailer 4
-
£168 GBP
$225 USD
View
A
Retailer 5
-
£191 GBP
HK$2,000 HKD
View
B+
Retailer 6
-
£227 GBP
$305 USD
View
A
Retailer 7
-
£284 GBP
€363 EUR
View
A
Retailer 8
-
£303 GBP
View
A
Retailer 9
-
£334 GBP
$448 USD
View
B+
Retailer 10
-
£364 GBP
$488 USD
View
B+
Retailer 11
-
£395 GBP
$530 USD
View
B+
Retailer 12
-
£424 GBP
$569 USD
View
B+
Retailer 13
-
£540 GBP
$724 USD
View
B+
Retailer 14
-
£550 GBP
SGD 998 SGD
View
Retailer 15
-
£775 GBP
$1,040 USD
View
Price last confirmed 33 days ago
B
Retailer 16
-
£785 GBP
View
Most Expensive
B
Brilliant Earth
20675146A · Oct 31
£969 GBP
$1,300 USD
View
16 more retailers have this diamond
Prices start from £136 GBPSave up to £833 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
1.59ct Radiant
£136 GBP