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Cushion|Lab Grown|IGI

1.59ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG693553609

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG693553609

Diamond specifications and retailer prices

From £307 GBP
$411 USD
As of October 30, 2026
Save £589 GBP (66%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £896 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.59ct lab-grown cushion diamond

This 1.59ct lab-grown cushion 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 LG693553609 or 693553609. Listed at 9 retailers as of October 30, 2026, with prices from £307 to £896, a £589 spread on the same certified stone. Brilliant Earth lists it at £896. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle29.3°
Pavilion angle42.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG693553609
Dimensions8.02 × 6.31 × 4.23 mm
L/W Ratio1.27
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.02 mm6.31 mm1.59 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG693553609
Side View
Table 64.0%Crown 29.3°Girdle: MED-STKPavilion 42.4°Culet: NoneDepth 67.0%

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 30
Current: £896 GBP|Low: £175 GBP|High: £1,015 GBP|Avg: £463 GBP|-11.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 6£175 GBP
Retailer 5£196 GBP
Retailer 7£307 GBP
Retailer 3£310 GBP
Retailer 2£317 GBP
Retailer 9£398 GBP
Retailer 8£426 GBP
Retailer 4£822 GBP
Brilliant Earth£896 GBP

36 data points across 9 retailers

9 retailers£307 GBP to £896 GBP

Retailer 1
-
£175 GBP
$234 USD
Price last confirmed 19 days ago
Retailer 2
-
£196 GBP
View
Price last confirmed 14 days ago
B+
Retailer 3
-
£307 GBP
$411 USD
View
A
Retailer 4
-
£310 GBP
€395 EUR
View
A
Retailer 5
-
£317 GBP
View
A
Retailer 6
-
£398 GBP
$533 USD
View
A
Retailer 7
-
£426 GBP
$571 USD
View
B
Retailer 8
-
£822 GBP
View
Most Expensive
B
Brilliant Earth
13584838A · Oct 30
£896 GBP
$1,200 USD
View
8 more retailers have this diamond
Prices start from £307 GBPSave up to £589 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 Cushion
£307 GBP