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Round|Lab Grown|GIA

1.78ct E SI1 Round Lab Grown Diamond

EX • E/SI1 • GIA 2487040493

Certificate GIA 2487040493

Diamond specifications and retailer prices

From £445 GBP
$593 USD
As of October 29, 2026
Save £1,019 GBP (70%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £1,464 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2487040493. Listed at 5 retailers as of October 29, 2026, with prices from £445 to £1,464, a £1,019 spread on the same certified stone. Brilliant Earth lists it at £1,464. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle41.6°
OriginLab Grown
Grading LabGIA
CertificateGIA 2487040493
Dimensions7.76 × 7.80 × 4.81 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Girdle conditionFaceted
Culet sizeNone
Cert comments
This is a man-made diamond produced by CVD (Chemical Vapor Deposition) growth process and has evidence of post-growth treatments to change the color.
Key to symbols
Growth Remnant
Top View
7.76 mm7.80 mm1.78 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2487040493
Side View
Table 59.0%Crown 34°Girdle: MediumPavilion 41.6°Culet: NoneDepth 61.8%

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: £1,464 GBP|Low: £445 GBP|High: £2,153 GBP|Avg: £1,283 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 29, 2026
Retailer 4£445 GBP
Retailer 3£644 GBP
Retailer 5£664 GBP
Retailer 2£787 GBP
Brilliant Earth£1,464 GBP
Retailer 7£2,134 GBP
Retailer 6£2,153 GBP

7 data points across 7 retailers

5 retailers£445 GBP to £1,464 GBP

A
Cheapest Retailer
-
£445 GBP
$593 USD
B+
Retailer 2
-
£644 GBP
HK$6,700 HKD
View
B+
Retailer 3
-
£664 GBP
$884 USD
View
B+
Retailer 4
-
£787 GBP
€998 EUR
View
Most Expensive
B
Brilliant Earth
8686788A · Oct 29
£1,464 GBP
$1,950 USD
View
4 more retailers have this diamond
Prices start from £445 GBPSave up to £1,019 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
£445 GBP