Marquise|Lab Grown|IGI

1.50ct D SI1 Marquise Lab Grown Diamond

EX • D/SI1 • IGI LG154427

Certificate IGI LG154427

Diamond specifications and retailer prices

From £1,228 GBP
As of October 31, 2026
3 retailers carry this diamond
Most expensive: £1,228 GBP at Diamond Quarter
View at Diamond Quarter

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 top-tier cut grade and certified by IGI LG154427 or 154427. Listed at 3 retailers as of October 31, 2026. 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
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG154427
Dimensions12.16 × 6.07 × 3.55 mm
L/W Ratio2.00
Top View
12.16 mm6.07 mm1.50 ctD / SI1
OriginLab Grown
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG154427
Side View
Table 69.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 58.5%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Oct 31
Current: £1,228 GBP|Low: £179 GBP|High: £1,500 GBP|Avg: £893 GBP
Diamond Quarter
Retailer 2
Retailer 3
Retailer 4
October 21, 2026
Retailer 2£179 GBP
Retailer 3£616 GBP
Diamond Quarter£1,228 GBP
Retailer 4£1,500 GBP

6 data points across 4 retailers

3 retailers

Retailer 1
-
£179 GBP
$240 USD
Price last confirmed 8 days ago
Retailer 2
-
£616 GBP
$825 USD
View
Price last confirmed 7 days ago
Most Expensive
B
Diamond Quarter
1.5SI1DLG06CFFDN · Oct 31
£1,228 GBP
View
2 more retailers have this diamond

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
£1,228 GBP