CaratHunter
Plans
Radiant|Lab Grown|IGI

1.78ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • IGI LG700558977

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG700558977

Diamond specifications and retailer prices

From £160 GBP
$214 USD
As of October 30, 2026
Save £639 GBP (80%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £799 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.78ct lab-grown radiant diamond

This 1.78ct lab-grown radiant sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG700558977 or 700558977. Listed at 13 retailers as of October 29, 2026, with prices from £160 to £799, a £639 spread on the same certified stone. MOH London lists it at £799. 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
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle45.2°
Pavilion angle34.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG700558977
Dimensions8.74 × 5.97 × 3.87 mm
L/W Ratio1.46
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
8.74 mm5.97 mm1.78 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG700558977
Side View
Table 68.0%Crown 45.2°Girdle: MED-STKPavilion 34.4°Culet: NoneDepth 64.8%

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 30
Current: £799 GBP|Low: £160 GBP|High: £1,993 GBP|Avg: £560 GBP
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
Retailer 14
Retailer 15
Retailer 16
October 31, 2026
Retailer 11£160 GBP
Retailer 5£186 GBP
Retailer 13£199 GBP
Retailer 12£221 GBP
Retailer 3£229 GBP
Retailer 2£331 GBP
Retailer 4£340 GBP
Retailer 9£367 GBP
Retailer 14£396 GBP
Retailer 16£490 GBP
Retailer 15£637 GBP
Retailer 10£640 GBP
Retailer 6£656 GBP
MOH London£799 GBP
Retailer 7£1,185 GBP
Retailer 8£1,993 GBP

4 data points across 16 retailers

13 retailers£160 GBP to £799 GBP

A
Cheapest Retailer
-
£160 GBP
$214 USD
A
Retailer 2
-
£186 GBP
$249 USD
View
A
Retailer 3
-
£199 GBP
$266 USD
View
A
Retailer 4
-
£221 GBP
View
A
Retailer 5
-
£229 GBP
HK$2,400 HKD
View
A
Retailer 6
-
£331 GBP
€422 EUR
View
B+
Retailer 7
-
£340 GBP
$455 USD
View
A
Retailer 8
-
£367 GBP
View
A
Retailer 9
-
£396 GBP
$531 USD
View
B+
Retailer 10
-
£490 GBP
$656 USD
View
B+
Retailer 11
-
£637 GBP
$854 USD
View
B+
Retailer 12
-
£640 GBP
$857 USD
View
Most Expensive
B
MOH London
LG700558977 · Oct 29
£799 GBP
View
12 more retailers have this diamond
Prices start from £160 GBPSave up to £639 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 Radiant
£160 GBP