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Round|Lab Grown|GIA

1.78ct D SI2 Round Lab Grown Diamond

EX • D/SI2 • GIA 2457007520

Certificate GIA 2457007520

Diamond specifications and retailer prices

From £309 GBP
$411 USD
As of October 29, 2026
Save £1,195 GBP (79%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,504 GBP at MOH London · As of October 29, 2026
View at MOH London

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 D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2457007520. Listed at 15 retailers as of October 29, 2026, with prices from £309 to £1,504, a £1,195 spread on the same certified stone. MOH London lists it at £1,504. 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
D
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.6°
OriginLab Grown
Grading LabGIA
CertificateGIA 2457007520
Dimensions7.80 × 7.78 × 4.80 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
7.80 mm7.78 mm1.78 ctD / SI2
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2457007520
Side View
Table 56.0%Crown 35°Girdle: NUL-NULPavilion 40.6°Culet: NoneDepth 61.6%

Caratlytics Score

How it works →
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: £1,504 GBP|Low: £297 GBP|High: £1,513 GBP|Avg: £665 GBP|+0.6%
MOH London
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 9£309 GBP
Retailer 13£345 GBP
Retailer 5£383 GBP
Retailer 11£383 GBP
Retailer 4£518 GBP
Retailer 2£571 GBP
Retailer 12£572 GBP
Retailer 6£617 GBP
Retailer 8£676 GBP
Retailer 10£909 GBP
Retailer 7£930 GBP
Retailer 3£1,231 GBP
MOH London£1,504 GBP

43 data points across 13 retailers

15 retailers£309 GBP to £1,504 GBP

A
Cheapest Retailer
-
£309 GBP
$411 USD
A
Retailer 2
-
£345 GBP
$460 USD
View
A
Retailer 3
-
£383 GBP
$510 USD
View
A
Retailer 4
-
£383 GBP
$510 USD
View
A
Retailer 5
-
£423 GBP
HK$4,400 HKD
View
B+
Retailer 6
-
£518 GBP
$690 USD
View
B+
Retailer 7
-
£571 GBP
View
B+
Retailer 8
-
£572 GBP
$762 USD
View
B+
Retailer 9
-
£617 GBP
€783 EUR
View
B+
Retailer 10
-
£676 GBP
$900 USD
View
B+
Retailer 11
-
£712 GBP
$948 USD
View
B
Retailer 12
-
£909 GBP
$1,210 USD
View
B
Retailer 13
-
£930 GBP
$1,238 USD
View
B
Retailer 14
-
£1,231 GBP
$1,639 USD
View
Most Expensive
B
MOH London
2457007520 · Oct 29
£1,504 GBP
View
14 more retailers have this diamond
Prices start from £309 GBPSave up to £1,195 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
£309 GBP