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Cushion|Lab Grown|IGI

1.38ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG623488097

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG623488097

Diamond specifications and retailer prices

From £172 GBP
$231 USD
As of October 30, 2026
Save £736 GBP (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £908 GBP at Reve Diamonds · As of October 30, 2026
View at Reve Diamonds

About this 1.38ct lab-grown cushion diamond

This 1.38ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG623488097 or 623488097. Listed at 12 retailers as of October 30, 2026, with prices from £172 to £908, a £736 spread on the same certified stone. Reve Diamonds lists it at £908. 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

1.38
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.6°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG623488097
Dimensions6.73 × 6.52 × 4.40 mm
L/W Ratio1.03
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.73 mm6.52 mm1.38 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG623488097
Side View
Table 62.0%Crown 39.6°Girdle: MED-THKPavilion 41.2°Culet: NoneDepth 67.5%

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: £634 GBP|Low: £122 GBP|High: £1,202 GBP|Avg: £535 GBP|-47.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Reve Diamonds
October 30, 2026
Retailer 6£172 GBP
Retailer 2£331 GBP
Retailer 4£354 GBP
Retailer 5£367 GBP
Retailer 10£378 GBP
Retailer 9£419 GBP
Retailer 11£520 GBP
Retailer 1£634 GBP
Retailer 8£653 GBP
Retailer 3£656 GBP
Retailer 7£773 GBP
Reve Diamonds£908 GBP

43 data points across 12 retailers

12 retailers£172 GBP to £908 GBP

A
Cheapest Retailer
-
£172 GBP
$231 USD
Final sale: no returns
A
Retailer 2
-
£331 GBP
$444 USD
View
A
Retailer 3
-
£354 GBP
View
A
Retailer 4
-
£367 GBP
€468 EUR
View
A
Retailer 5
-
£378 GBP
$507 USD
View
B+
Retailer 6
-
£419 GBP
$562 USD
View
B+
Retailer 7
-
£520 GBP
$697 USD
View
B+
Retailer 8
-
£634 GBP
$850 USD
View
Retailer 9
-
£653 GBP
$875 USD
View
Price last confirmed 10 days ago
B
Retailer 10
-
£656 GBP
$880 USD
View
B
Retailer 11
-
£773 GBP
View
Most Expensive
B
Reve Diamonds
48E84B908 · Oct 30
£908 GBP
$1,217 USD
View
11 more retailers have this diamond
Prices start from £172 GBPSave up to £736 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
1.38ct Cushion
£172 GBP