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Round|Lab Grown|IGI

1.78ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG492112351

Shape and cutting style on the report: Round brilliant

Certificate IGI LG492112351

Diamond specifications and retailer prices

From $1,000 USD
As of October 31, 2026
Save $4,144 USD (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $5,144 USD at MOH London · As of October 29, 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG492112351 or 492112351. Listed at 12 retailers as of October 29, 2026, with prices from $1,000 to $5,144, a $4,144 spread on the same certified stone. MOH London lists it at $5,144. 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
J
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG492112351
Dimensions7.75 × 7.80 × 4.80 mm
L/W Ratio1.01
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
7.75 mm7.80 mm1.78 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG492112351
Side View
Table 58.0%Crown 34.9°Girdle: MediumPavilion 41.3°Culet: NoneDepth 61.6%

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 31
Current: $5,144 USD|Low: $1,000 USD|High: $5,184 USD|Avg: $2,185 USD|+0.5%
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
November 1, 2026
Retailer 6$1,000 USD
Retailer 7$1,373 USD
Retailer 11$1,493 USD
Retailer 10$1,537 USD
Retailer 8$1,592 USD
Retailer 13$1,592 USD
Retailer 3$1,765 USD
Retailer 2$2,084 USD
Retailer 5$2,189 USD
Retailer 9$2,515 USD
Retailer 4$2,968 USD
Retailer 12$2,984 USD
MOH London$5,144 USD

24 data points across 13 retailers

12 retailers$1,000 USD to $5,144 USD

A
Cheapest Retailer
-
$1,000 USD
B+
Retailer 2
-
$1,373 USD
View
B+
Retailer 3
-
$1,493 USD
View
B+
Retailer 4
-
$1,537 USD
View
Final sale: no returns
Retailer 5
-
$1,592 USD
View
Price last confirmed 19 days ago
B+
Retailer 6
-
$1,592 USD
View
B+
Retailer 7
-
$1,765 USD
View
B+
Retailer 8
-
$2,084 USD
£1,641 GBP
View
B
Retailer 9
-
$2,515 USD
View
B
Retailer 10
-
$2,968 USD
View
B
Retailer 11
-
$2,984 USD
View
Most Expensive
B
MOH London
LG492112351 · Oct 29
$5,144 USD
£4,050 GBP
View
11 more retailers have this diamond
Prices start from $1,000 USDSave up to $4,144 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
$1,000 USD