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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 $305 AUD
$214 USD
As of October 30, 2026
Save $1,219 AUD (80%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,524 AUD 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 $305 to $1,524, a $1,219 spread on the same certified stone. MOH London lists it at $1,524. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $1,524 AUD|Low: $305 AUD|High: $3,801 AUD|Avg: $1,069 AUD
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$305 AUD
Retailer 5$354 AUD
Retailer 13$379 AUD
Retailer 12$422 AUD
Retailer 3$437 AUD
Retailer 2$631 AUD
Retailer 4$648 AUD
Retailer 9$700 AUD
Retailer 14$756 AUD
Retailer 16$934 AUD
Retailer 15$1,216 AUD
Retailer 10$1,220 AUD
Retailer 6$1,250 AUD
MOH London$1,524 AUD
Retailer 7$2,261 AUD
Retailer 8$3,801 AUD

4 data points across 16 retailers

13 retailers$305 AUD to $1,524 AUD

A
Cheapest Retailer
-
$305 AUD
$214 USD
A
Retailer 2
-
$354 AUD
$249 USD
View
A
Retailer 3
-
$379 AUD
$266 USD
View
A
Retailer 4
-
$422 AUD
£234 GBP
View
A
Retailer 5
-
$437 AUD
HK$2,400 HKD
View
A
Retailer 6
-
$631 AUD
€422 EUR
View
B+
Retailer 7
-
$648 AUD
$455 USD
View
A
Retailer 8
-
$700 AUD
£387 GBP
View
A
Retailer 9
-
$756 AUD
$531 USD
View
B+
Retailer 10
-
$934 AUD
$656 USD
View
B+
Retailer 11
-
$1,216 AUD
$854 USD
View
B+
Retailer 12
-
$1,220 AUD
$857 USD
View
Most Expensive
B
MOH London
LG700558977 · Oct 29
$1,524 AUD
£843 GBP
View
12 more retailers have this diamond
Prices start from $305 AUDSave up to $1,219 AUD

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
$305 AUD