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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 $380 NZD
$214 USD
As of October 30, 2026
Save $1,520 NZD (80%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,900 NZD 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 $380 to $1,900, a $1,520 spread on the same certified stone. MOH London lists it at $1,900. 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

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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 30
Current: $1,900 NZD|Low: $380 NZD|High: $4,737 NZD|Avg: $1,327 NZD
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
November 1, 2026
Retailer 12$380 NZD
Retailer 5$442 NZD
Retailer 13$472 NZD
Retailer 2$525 NZD
Retailer 3$545 NZD
Retailer 10$786 NZD
Retailer 4$807 NZD
Retailer 9$873 NZD
Retailer 14$942 NZD
Retailer 16$1,164 NZD
Retailer 15$1,515 NZD
Retailer 11$1,521 NZD
Retailer 6$1,559 NZD
MOH London$1,900 NZD
Retailer 7$2,818 NZD
Retailer 8$4,737 NZD

5 data points across 16 retailers

13 retailers$380 NZD to $1,900 NZD

A
Cheapest Retailer
-
$380 NZD
$214 USD
A
Retailer 2
-
$442 NZD
$249 USD
View
A
Retailer 3
-
$472 NZD
$266 USD
View
A
Retailer 4
-
$525 NZD
£233 GBP
View
A
Retailer 5
-
$545 NZD
HK$2,400 HKD
View
A
Retailer 6
-
$786 NZD
€422 EUR
View
B+
Retailer 7
-
$807 NZD
$455 USD
View
A
Retailer 8
-
$873 NZD
£387 GBP
View
A
Retailer 9
-
$942 NZD
$531 USD
View
B+
Retailer 10
-
$1,164 NZD
$656 USD
View
B+
Retailer 11
-
$1,515 NZD
$854 USD
View
B+
Retailer 12
-
$1,521 NZD
$857 USD
View
Most Expensive
B
MOH London
LG700558977 · Oct 29
$1,900 NZD
£843 GBP
View
12 more retailers have this diamond
Prices start from $380 NZDSave up to $1,520 NZD

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
$380 NZD