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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 $299 CAD
$214 USD
As of October 30, 2026
Save $1,197 CAD (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,496 CAD 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 12 retailers as of October 29, 2026, with prices from $299 to $1,496, a $1,197 spread on the same certified stone. MOH London lists it at $1,496. 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
Color
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: $1,496 CAD|Low: $299 CAD|High: $3,730 CAD|Avg: $1,047 CAD
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 9$299 CAD
Retailer 4$348 CAD
Retailer 12$372 CAD
Retailer 10$414 CAD
Retailer 16$429 CAD
Retailer 5$544 CAD
Retailer 3$636 CAD
Retailer 11$687 CAD
Retailer 13$742 CAD
Retailer 15$916 CAD
Retailer 14$1,193 CAD
Retailer 2$1,197 CAD
Retailer 6$1,227 CAD
MOH London$1,496 CAD
Retailer 7$2,218 CAD
Retailer 8$3,730 CAD

4 data points across 16 retailers

12 retailers$299 CAD to $1,496 CAD

A
Cheapest Retailer
-
$299 CAD
$214 USD
A
Retailer 2
-
$348 CAD
$249 USD
View
A
Retailer 3
-
$372 CAD
$266 USD
View
A
Retailer 4
-
$414 CAD
£234 GBP
View
A
Retailer 5
-
$429 CAD
HK$2,400 HKD
View
B+
Retailer 6
-
$636 CAD
$455 USD
View
A
Retailer 7
-
$687 CAD
£387 GBP
View
A
Retailer 8
-
$742 CAD
$531 USD
View
B+
Retailer 9
-
$916 CAD
$656 USD
View
B+
Retailer 10
-
$1,193 CAD
$854 USD
View
Retailer 11
-
$1,197 CAD
$857 USD
View
Most Expensive
B
MOH London
LG700558977 · Oct 29
$1,496 CAD
£843 GBP
View
11 more retailers have this diamond
Prices start from $299 CADSave up to $1,197 CAD

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
$299 CAD