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Cushion|Lab Grown|IGI

1.63ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG494183935

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG494183935

Diamond specifications and retailer prices

From £167 GBP
$224 USD
As of October 30, 2026
Save £930 GBP (85%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,097 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.63ct lab-grown cushion diamond

This 1.63ct 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 LG494183935 or 494183935. Listed at 13 retailers as of October 29, 2026, with prices from £167 to £1,097, a £930 spread on the same certified stone. Brilliant Earth lists it at £1,097. 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

1.63
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.1°
Pavilion angle34.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG494183935
Dimensions6.72 × 6.52 × 4.41 mm
L/W Ratio1.03
Girdle conditionFaceted
Culet sizePointed
Top View
6.72 mm6.52 mm1.63 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG494183935
Side View
Table 59.0%Crown 32.1°Girdle: THN-STKPavilion 34.9°Culet: NoneDepth 67.6%

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: £1,097 GBP|Low: £98 GBP|High: £1,172 GBP|Avg: £510 GBP|-6.4%
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
October 29, 2026
Retailer 5£98 GBP
Retailer 13£167 GBP
Retailer 11£185 GBP
Retailer 7£250 GBP
Retailer 2£305 GBP
Retailer 14£375 GBP
Retailer 3£417 GBP
Retailer 12£437 GBP
Retailer 10£474 GBP
Retailer 6£636 GBP
Retailer 9£780 GBP
Retailer 8£868 GBP
Retailer 4£891 GBP
Brilliant Earth£1,097 GBP

26 data points across 14 retailers

13 retailers£167 GBP to £1,097 GBP

A
Cheapest Retailer
-
£167 GBP
$224 USD
Final sale: no returns
A
Retailer 2
-
£185 GBP
$248 USD
View
B+
Retailer 3
-
£250 GBP
$335 USD
View
A
Retailer 4
-
£305 GBP
€389 EUR
View
A
Retailer 5
-
£375 GBP
$502 USD
View
A
Retailer 6
-
£417 GBP
$559 USD
View
A
Retailer 7
-
£437 GBP
$585 USD
View
B+
Retailer 8
-
£474 GBP
$635 USD
View
B+
Retailer 9
-
£636 GBP
$852 USD
View
Retailer 10
-
£780 GBP
$1,045 USD
View
Price last confirmed 9 days ago
B
Retailer 11
-
£868 GBP
View
B
Retailer 12
-
£891 GBP
$1,195 USD
View
Most Expensive
B
Brilliant Earth
9518221A · Oct 29
£1,097 GBP
$1,470 USD
View
12 more retailers have this diamond
Prices start from £167 GBPSave up to £930 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
1.63ct Cushion
£167 GBP