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Princess|Lab Grown|IGI

1.78ct E SI1 Princess Lab Grown Diamond

GD • E/SI1 • IGI LG782685741

Certificate IGI LG782685741

Diamond specifications and retailer prices

From £1,720 GBP
$2,290 USD
As of October 29, 2026
1 retailer carries this diamond
Only listing: £1,720 GBP at Brilliant Earth
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Brilliant Earth

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 E colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG782685741 or 782685741. Listed at a single retailer as of October 29, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

1.78
Carat
E
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG782685741
Dimensions6.57 × 6.50 × 4.78 mm
L/W Ratio1.01
Top View
6.57 mm6.50 mm1.78 ctE / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG782685741
Side View
Table 71.0%CrownGirdle: MediumPavilionCulet: NoneDepth 74.0%

Caratlytics Score

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C
Average
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Price History

Last verified: Oct 29
Current: £1,720 GBP|Low: £1,720 GBP|High: £1,720 GBP|Avg: £1,720 GBP
September 23, 2026
Brilliant Earth£1,720 GBP

1 data point across 1 retailer

1 retailer

C
Brilliant Earth
6521162B · Oct 29
£1,720 GBP
$2,290 USD
View

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C
1.78ct Princess
£1,720 GBP