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Marquise|Lab Grown|IGI

1.50ct D SI1 Marquise Lab Grown Diamond

GD • D/SI1 • IGI LG821630371

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG821630371

Diamond specifications and retailer prices

From £214 GBP
As of October 27, 2026
Save £1,242 GBP (85%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,455 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.5ct lab-grown marquise diamond

This 1.5ct lab-grown marquise sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG821630371 or 821630371. Listed at 16 retailers as of October 27, 2026, with prices from £214 to £1,455, a £1,242 spread on the same certified stone. Brilliant Earth lists it at £1,455. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.50
Carat
D
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle35.2°
Pavilion angle39.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG821630371
Dimensions12.16 × 6.07 × 3.55 mm
L/W Ratio2.00
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.16 mm6.07 mm1.50 ctD / SI1
OriginLab Grown
CutGood
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG821630371
Side View
Table 69.0%Crown 35.2°Girdle: MED-STKPavilion 39.4°Culet: NoneDepth 58.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 27
Current: £1,455 GBP|Low: £149 GBP|High: £1,500 GBP|Avg: £498 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
October 27, 2026
Retailer 10£154 GBP
Retailer 3£172 GBP
Retailer 12£192 GBP
Retailer 7£214 GBP
Retailer 2£310 GBP
Retailer 14£331 GBP
Retailer 8£351 GBP
Retailer 5£375 GBP
Retailer 4£382 GBP
Retailer 13£495 GBP
Retailer 6£625 GBP
Retailer 9£769 GBP
Retailer 11£787 GBP
Brilliant Earth£1,455 GBP

39 data points across 14 retailers

16 retailers£214 GBP to £1,455 GBP

Retailer 1
-
£154 GBP
$207 USD
Price last confirmed 9 days ago
Retailer 2
-
£179 GBP
$240 USD
View
Price last confirmed 18 days ago
Retailer 3
-
£192 GBP
$257 USD
View
Price last confirmed 7 days ago
B+
Retailer 4
-
£214 GBP
View
B+
Retailer 5
-
£220 GBP
HK$2,300 HKD
View
B+
Retailer 6
-
£310 GBP
€396 EUR
View
Retailer 7
-
£331 GBP
$444 USD
View
Price last confirmed 7 days ago
B+
Retailer 8
-
£351 GBP
View
B+
Retailer 9
-
£375 GBP
$502 USD
View
B+
Retailer 10
-
£382 GBP
$512 USD
View
B
Retailer 11
-
£495 GBP
$663 USD
View
Retailer 12
-
£616 GBP
$825 USD
View
Price last confirmed 16 days ago
B
Retailer 13
-
£625 GBP
SGD 1,131 SGD
View
Retailer 14
-
£769 GBP
View
Price last confirmed 7 days ago
B
Retailer 15
-
£787 GBP
$1,055 USD
View
Most Expensive
C
Brilliant Earth
20781913A · Oct 31
£1,455 GBP
$1,950 USD
View
15 more retailers have this diamond
Prices start from £214 GBPSave up to £1,242 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.

B+
1.50ct Marquise
£214 GBP