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Round|Lab Grown|IGI

1.78ct I SI2 Round Lab Grown Diamond

ID • I/SI2 • IGI LG490193814

Shape and cutting style on the report: Round brilliant

Certificate IGI LG490193814

Diamond specifications and retailer prices

From $1,280 USD
As of October 29, 2026
Save $3,536 USD (73%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $4,816 USD at MOH London · As of October 25, 2026
View at MOH London

About this 1.78ct lab-grown round diamond

This 1.78ct lab-grown round sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG490193814 or 490193814. Listed at 10 retailers as of October 25, 2026, with prices from $1,280 to $4,816, a $3,536 spread on the same certified stone. MOH London lists it at $4,816. 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
I
Color
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle33.5°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG490193814
Dimensions7.82 × 7.85 × 4.71 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.82 mm7.85 mm1.78 ctI / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG490193814
Side View
Table 59.0%Crown 33.5°GirdlePavilion 40.5°Culet: NoneDepth 60.1%

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 29
Current: $4,816 USD|Low: $1,280 USD|High: $4,867 USD|Avg: $2,578 USD|-0.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 25, 2026
Retailer 2$1,280 USD
Retailer 4$1,579 USD
Retailer 5$1,625 USD
Retailer 7$2,298 USD
Retailer 3$2,655 USD
Retailer 6$3,056 USD
Retailer 8$3,769 USD
MOH London$4,816 USD

9 data points across 8 retailers

10 retailers$1,280 USD to $4,816 USD

A
Cheapest Retailer
-
$1,280 USD
B+
Retailer 2
-
$1,452 USD
View
B+
Retailer 3
-
$1,579 USD
View
B+
Retailer 4
-
$1,625 USD
View
Final sale: no returns
B+
Retailer 5
-
$1,684 USD
View
B+
Retailer 6
-
$1,684 USD
View
Price last confirmed 17 days ago
B
Retailer 7
-
$2,655 USD
View
B
Retailer 8
-
$3,056 USD
View
B
Retailer 9
-
$3,156 USD
View
Most Expensive
B
MOH London
LG490193814 · Oct 25
$4,816 USD
£3,792 GBP
View
9 more retailers have this diamond
Prices start from $1,280 USDSave up to $3,536 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 Round
$1,280 USD