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Round|Lab Grown|IGI

1.78ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG629482184

Shape and cutting style on the report: Round brilliant

Certificate IGI LG629482184

Diamond specifications and retailer prices

From £158 GBP
$210 USD
As of October 29, 2026
Save £1,539 GBP (91%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,697 GBP at Jared · As of October 28, 2026
View at Jared

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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG629482184 or 629482184. Listed at 10 retailers as of October 28, 2026, with prices from £158 to £1,697, a £1,539 spread on the same certified stone. Jared lists it at £1,697. 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
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.7°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG629482184
Dimensions7.78 × 7.82 × 4.76 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.78 mm7.82 mm1.78 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG629482184
Side View
Table 58.0%Crown 33.7°Girdle: MediumPavilion 40.9°Culet: NoneDepth 61.1%

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: £872 GBP|Low: £132 GBP|High: £1,569 GBP|Avg: £633 GBP|-2.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 29, 2026
Retailer 11£158 GBP
Retailer 12£179 GBP
Retailer 10£183 GBP
Retailer 9£336 GBP
Retailer 2£422 GBP
Retailer 3£463 GBP
Retailer 13£500 GBP
Retailer 6£632 GBP
Retailer 7£695 GBP
Retailer 5£743 GBP
Retailer 1£872 GBP
Retailer 4£1,126 GBP
Retailer 8£1,517 GBP

17 data points across 13 retailers

10 retailers£158 GBP to £1,697 GBP

A
Cheapest Retailer
-
£158 GBP
$210 USD
A
Retailer 2
-
£179 GBP
$238 USD
View
Final sale: no returns
A
Retailer 3
-
£183 GBP
$244 USD
View
B+
Retailer 4
-
£336 GBP
$448 USD
View
B+
Retailer 5
-
£632 GBP
$842 USD
View
B+
Retailer 6
-
£695 GBP
$926 USD
View
B
Retailer 7
-
£872 GBP
View
B
Retailer 8
-
£1,126 GBP
$1,500 USD
View
B
Retailer 9
-
£1,517 GBP
$2,020 USD
View
Most Expensive
B
Jared
150918409 · Oct 28
£1,697 GBP
$2,260 USD
View
9 more retailers have this diamond
Prices start from £158 GBPSave up to £1,539 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
£158 GBP