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Round|Lab Grown|IGI

1.78ct D SI2 Round Lab Grown Diamond

ID • D/SI2 • IGI LG478122782

Shape and cutting style on the report: Round brilliant

Certificate IGI LG478122782

Diamond specifications and retailer prices

From $213 USD
As of October 29, 2026
Save $960 USD (82%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $1,173 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 D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG478122782 or 478122782. Listed at 7 retailers as of October 29, 2026, with prices from $213 to $1,173, a $960 spread on the same certified stone. MOH London lists it at $1,173. 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
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle41.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG478122782
Dimensions7.74 × 7.71 × 4.83 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.74 mm7.71 mm1.78 ctD / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG478122782
Side View
Table 58.0%Crown 35.2°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.5%

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: $1,173 USD|Low: $207 USD|High: $1,208 USD|Avg: $700 USD|-2.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 9$213 USD
Retailer 8$247 USD
Retailer 7$453 USD
Retailer 2$457 USD
Retailer 12$583 USD
Retailer 3$627 USD
Retailer 11$807 USD
Retailer 5$851 USD
Retailer 6$936 USD
Retailer 10$936 USD
Retailer 4$1,130 USD
MOH London$1,173 USD

39 data points across 12 retailers

7 retailers$213 USD to $1,173 USD

A
Cheapest Retailer
-
$213 USD
A
Retailer 2
-
$247 USD
View
B+
Retailer 3
-
$453 USD
View
A
Retailer 4
-
$457 USD
£360 GBP
View
B
Retailer 5
-
$851 USD
View
B+
Retailer 6
-
$936 USD
View
Most Expensive
B
MOH London
LG478122782 · Oct 29
$1,173 USD
£924 GBP
View
6 more retailers have this diamond
Prices start from $213 USDSave up to $960 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
$213 USD