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Cushion|Lab Grown|IGI

1.50ct D SI1 Cushion Lab Grown Diamond

EX • D/SI1 • IGI LG623451210

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG623451210

Diamond specifications and retailer prices

From £225 GBP
$301 USD
As of October 30, 2026
Save £1,559 GBP (87%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,784 GBP at Do Amore Diamonds · As of November 1, 2026
View at Do Amore Diamonds

About this 1.5ct lab-grown cushion diamond

This 1.5ct 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 LG623451210 or 623451210. Listed at 12 retailers as of October 30, 2026, with prices from £225 to £1,784, a £1,559 spread on the same certified stone. Do Amore Diamonds lists it at £1,784. 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

1.50
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.9°
Pavilion angle36.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG623451210
Dimensions6.90 × 6.68 × 4.23 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
6.90 mm6.68 mm1.50 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG623451210
Side View
Table 60.0%Crown 36.9°Girdle: MED-STKPavilion 36.7°Culet: NoneDepth 63.3%

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: £1,784 GBP|Low: £225 GBP|High: £1,948 GBP|Avg: £749 GBP|-8.4%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 7£225 GBP
Retailer 6£249 GBP
Retailer 3£295 GBP
Retailer 5£308 GBP
Retailer 10£328 GBP
Retailer 11£333 GBP
Retailer 2£484 GBP
Retailer 8£1,054 GBP
Retailer 4£1,109 GBP
Retailer 9£1,485 GBP
Do Amore Diamonds£1,784 GBP

40 data points across 11 retailers

12 retailers£225 GBP to £1,784 GBP

A
Cheapest Retailer
-
£225 GBP
$301 USD
Final sale: no returns
Retailer 2
-
£249 GBP
$334 USD
View
Price last confirmed 7 days ago
A
Retailer 3
-
£295 GBP
$395 USD
View
Retailer 4
-
£308 GBP
View
Price last confirmed 15 days ago
A
Retailer 5
-
£328 GBP
$440 USD
View
B+
Retailer 6
-
£333 GBP
$446 USD
View
A
Retailer 7
-
£369 GBP
$495 USD
View
B+
Retailer 8
-
£484 GBP
View
B
Retailer 9
-
£1,008 GBP
$1,350 USD
View
B
Retailer 10
-
£1,054 GBP
$1,413 USD
View
B
Retailer 11
-
£1,109 GBP
View
Most Expensive
B
Do Amore Diamonds
27-26C7668BD · Nov 1
£1,784 GBP
$2,390 USD
View
11 more retailers have this diamond
Prices start from £225 GBPSave up to £1,559 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
1.50ct Cushion
£225 GBP