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Princess|Lab Grown|IGI

1.78ct K SI1 Princess Lab Grown Diamond

ID • K/SI1 • IGI LG445039133

Shape and cutting style on the report: Princess cut

Certificate IGI LG445039133

Diamond specifications and retailer prices

From £799 GBP
As of November 6, 2026
Save £2,336 GBP (75%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £3,136 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.78ct lab-grown princess diamond

This 1.78ct lab-grown princess sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG445039133 or 445039133. Listed at 9 retailers as of November 5, 2026, with prices from £799 to £3,136, a £2,336 spread on the same certified stone. MOH London lists it at £3,136. 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

1.78
Carat
K
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle43°
Pavilion angle38.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG445039133
Dimensions6.75 × 6.56 × 4.63 mm
L/W Ratio1.03
Culet sizePointed
Cert comments
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Top View
6.75 mm6.56 mm1.78 ctK / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG445039133
Side View
Table 70.0%Crown 43°Girdle: MED-STKPavilion 38.2°Culet: NoneDepth 70.6%

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: Nov 6
Current: £3,136 GBP|Low: £799 GBP|High: £3,187 GBP|Avg: £1,723 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 5, 2026
Retailer 3£799 GBP
Retailer 2£1,055 GBP
Retailer 6£1,342 GBP
Retailer 4£1,477 GBP
Retailer 5£1,881 GBP
MOH London£3,136 GBP

14 data points across 6 retailers

9 retailers£799 GBP to £3,136 GBP

A
Cheapest Retailer
-
£799 GBP
A
Retailer 2
-
£869 GBP
View
Retailer 3
-
£927 GBP
View
Price last confirmed 25 days ago
B+
Retailer 4
-
£927 GBP
View
B+
Retailer 5
-
£1,055 GBP
View
B+
Retailer 6
-
£1,477 GBP
View
B
Retailer 7
-
£1,738 GBP
View
B
Retailer 8
-
£1,881 GBP
View
Most Expensive
B
MOH London
LG445039133 · Nov 5
£3,136 GBP
View
8 more retailers have this diamond
Prices start from £799 GBPSave up to £2,336 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
1.78ct Princess
£799 GBP