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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 $274 SGD
$214 USD
As of October 30, 2026
Save $1,095 SGD (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,369 SGD 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 $274 to $1,369, a $1,095 spread on the same certified stone. MOH London lists it at $1,369. 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: $1,369 SGD|Low: $274 SGD|High: $3,413 SGD|Avg: $958 SGD
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 10$274 SGD
Retailer 4$318 SGD
Retailer 12$340 SGD
Retailer 11$379 SGD
Retailer 16$393 SGD
Retailer 5$498 SGD
Retailer 3$582 SGD
Retailer 2$629 SGD
Retailer 13$679 SGD
Retailer 15$839 SGD
Retailer 14$1,092 SGD
Retailer 9$1,096 SGD
Retailer 6$1,123 SGD
MOH London$1,369 SGD
Retailer 7$2,030 SGD
Retailer 8$3,413 SGD

4 data points across 16 retailers

12 retailers$274 SGD to $1,369 SGD

A
Cheapest Retailer
-
$274 SGD
$214 USD
A
Retailer 2
-
$318 SGD
$249 USD
View
A
Retailer 3
-
$340 SGD
$266 USD
View
A
Retailer 4
-
$379 SGD
£234 GBP
View
A
Retailer 5
-
$393 SGD
HK$2,400 HKD
View
B+
Retailer 6
-
$582 SGD
$455 USD
View
A
Retailer 7
-
$629 SGD
£387 GBP
View
A
Retailer 8
-
$679 SGD
$531 USD
View
B+
Retailer 9
-
$839 SGD
$656 USD
View
B+
Retailer 10
-
$1,092 SGD
$854 USD
View
B+
Retailer 11
-
$1,096 SGD
$857 USD
View
Most Expensive
B
MOH London
LG700558977 · Oct 29
$1,369 SGD
£843 GBP
View
11 more retailers have this diamond
Prices start from $274 SGDSave up to $1,095 SGD

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
$274 SGD