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Round|Lab Grown|IGI

1.77ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG620415433

Shape and cutting style on the report: Round brilliant

Certificate IGI LG620415433

Diamond specifications and retailer prices

From £185 GBP
$247 USD
As of October 29, 2026
Save £1,046 GBP (85%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £1,232 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.77ct lab-grown round diamond

This 1.77ct 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 LG620415433 or 620415433. Listed at 19 retailers as of October 29, 2026, with prices from £185 to £1,232, a £1,046 spread on the same certified stone. Brilliant Earth lists it at £1,232. 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

1.77
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG620415433
Dimensions7.82 × 7.86 × 4.75 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.82 mm7.86 mm1.77 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG620415433
Side View
Table 59.0%Crown 33.2°Girdle: MediumPavilion 41.1°Culet: NoneDepth 60.6%

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: Oct 29
Current: £1,232 GBP|Low: £178 GBP|High: £1,382 GBP|Avg: £495 GBP|+9.3%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 29, 2026
Retailer 9£185 GBP
Retailer 3£208 GBP
Retailer 10£230 GBP
Retailer 11£230 GBP
Retailer 8£309 GBP
Retailer 5£379 GBP
Retailer 4£399 GBP
Retailer 2£435 GBP
Retailer 6£742 GBP
Retailer 7£923 GBP
Brilliant Earth£1,232 GBP

36 data points across 11 retailers

19 retailers£185 GBP to £1,232 GBP

A
Cheapest Retailer
-
£185 GBP
$247 USD
A
Retailer 2
-
£185 GBP
$247 USD
View
Price last confirmed 34 days ago
A
Retailer 3
-
£208 GBP
$277 USD
View
Final sale: no returns
A
Retailer 4
-
£216 GBP
$287 USD
View
Price last confirmed 37 days ago
A
Retailer 5
-
£227 GBP
$302 USD
View
Price last confirmed 34 days ago
A
Retailer 6
-
£230 GBP
$306 USD
View
A
Retailer 7
-
£230 GBP
$306 USD
View
A
Retailer 8
-
£260 GBP
HK$2,700 HKD
View
B+
Retailer 9
-
£309 GBP
$412 USD
View
A
Retailer 10
-
£379 GBP
€481 EUR
View
A
Retailer 11
-
£399 GBP
View
B+
Retailer 12
-
£426 GBP
$567 USD
View
A
Retailer 13
-
£435 GBP
View
B+
Retailer 14
-
£482 GBP
$642 USD
View
B
Retailer 15
-
£740 GBP
$985 USD
View
B
Retailer 16
-
£740 GBP
$985 USD
View
Price last confirmed 38 days ago
B
Retailer 17
-
£742 GBP
$988 USD
View
B
Retailer 18
-
£923 GBP
View
Most Expensive
B
Brilliant Earth
19043514A · Oct 29
£1,232 GBP
$1,640 USD
View
18 more retailers have this diamond
Prices start from £185 GBPSave up to £1,046 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
1.77ct Round
£185 GBP