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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 $214 USD
As of October 30, 2026
Save $857 USD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $1,071 USD 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 11 retailers as of October 29, 2026, with prices from $214 to $1,071, a $857 spread on the same certified stone. MOH London lists it at $1,071. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $1,071 USD|Low: $214 USD|High: $2,670 USD|Avg: $755 USD
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
October 30, 2026
Retailer 2$214 USD
Retailer 3$249 USD
Retailer 10$266 USD
Retailer 8$297 USD
Retailer 14$307 USD
Retailer 4$390 USD
Retailer 15$455 USD
Retailer 9$492 USD
Retailer 11$531 USD
Retailer 13$656 USD
Retailer 12$854 USD
Retailer 5$878 USD
MOH London$1,071 USD
Retailer 6$1,588 USD
Retailer 7$2,670 USD

3 data points across 15 retailers

11 retailers$214 USD to $1,071 USD

A
Cheapest Retailer
-
$214 USD
A
Retailer 2
-
$249 USD
View
A
Retailer 3
-
$266 USD
View
A
Retailer 4
-
$297 USD
£234 GBP
View
A
Retailer 5
-
$307 USD
HK$2,400 HKD
View
B+
Retailer 6
-
$455 USD
View
A
Retailer 7
-
$492 USD
£387 GBP
View
A
Retailer 8
-
$531 USD
View
B+
Retailer 9
-
$656 USD
View
B+
Retailer 10
-
$854 USD
View
Most Expensive
B
MOH London
LG700558977 · Oct 29
$1,071 USD
£843 GBP
View
10 more retailers have this diamond
Prices start from $214 USDSave up to $857 USD

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
$214 USD