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Round|Lab Grown|IGI

1.78ct E SI2 Round Lab Grown Diamond

VG • E/SI2 • IGI LG786624855

Shape and cutting style on the report: Round brilliant

Certificate IGI LG786624855

Diamond specifications and retailer prices

From £170 GBP
$226 USD
As of October 29, 2026
Save £979 GBP (85%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £1,149 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.78ct lab-grown round diamond

This 1.78ct lab-grown round sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI2 clarity (slightly-included), with a very-good cut grade and certified by IGI LG786624855 or 786624855. Listed at 13 retailers as of October 29, 2026, with prices from £170 to £1,149, a £979 spread on the same certified stone. Brilliant Earth lists it at £1,149. 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
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG786624855
Dimensions7.74 × 7.62 × 4.78 mm
L/W Ratio1.02
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
7.74 mm7.62 mm1.78 ctE / SI2
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG786624855
Side View
Table 59.0%Crown 37°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 62.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: £1,149 GBP|Low: £162 GBP|High: £1,149 GBP|Avg: £476 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 30, 2026
Retailer 9£170 GBP
Retailer 11£190 GBP
Retailer 3£210 GBP
Retailer 6£348 GBP
Retailer 12£357 GBP
Retailer 2£391 GBP
Retailer 10£408 GBP
Retailer 4£512 GBP
Retailer 8£570 GBP
Retailer 7£608 GBP
Retailer 5£846 GBP
Brilliant Earth£1,149 GBP

30 data points across 12 retailers

13 retailers£170 GBP to £1,149 GBP

A
Cheapest Retailer
-
£170 GBP
$226 USD
A
Retailer 2
-
£190 GBP
$253 USD
View
Final sale: no returns
A
Retailer 3
-
£210 GBP
$280 USD
View
A
Retailer 4
-
£348 GBP
€441 EUR
View
B+
Retailer 5
-
£357 GBP
$475 USD
View
B+
Retailer 6
-
£391 GBP
View
B+
Retailer 7
-
£408 GBP
$543 USD
View
B+
Retailer 8
-
£512 GBP
$682 USD
View
B
Retailer 9
-
£570 GBP
$759 USD
View
B
Retailer 10
-
£608 GBP
$810 USD
View
Retailer 11
-
£627 GBP
$835 USD
View
Price last confirmed 45 days ago
B
Retailer 12
-
£846 GBP
View
Most Expensive
B
Brilliant Earth
19892742A · Oct 29
£1,149 GBP
$1,530 USD
View
12 more retailers have this diamond
Prices start from £170 GBPSave up to £979 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 Round
£170 GBP