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Radiant|Lab Grown|IGI

1.78ct F SI1 Radiant Lab Grown Diamond

ID • F/SI1 • IGI LG780619896

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG780619896

Diamond specifications and retailer prices

From $200 USD
As of November 1, 2026
Save $1,520 USD (88%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,720 USD at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG780619896 or 780619896. Listed at 15 retailers as of October 31, 2026, with prices from $200 to $1,720, a $1,520 spread on the same certified stone. Do Amore Diamonds lists it at $1,720. 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
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.6°
Pavilion angle37°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780619896
Dimensions8.34 × 6.27 × 4.19 mm
L/W Ratio1.33
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
8.34 mm6.27 mm1.78 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780619896
Side View
Table 66.0%Crown 37.6°Girdle: MED-STKPavilion 37°Culet: NoneDepth 66.9%

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: Nov 1
Current: $1,720 USD|Low: $186 USD|High: $1,790 USD|Avg: $784 USD|+4.2%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 8$200 USD
Retailer 11$263 USD
Retailer 6$303 USD
Retailer 4$405 USD
Retailer 10$492 USD
Retailer 7$628 USD
Retailer 9$793 USD
Retailer 3$1,100 USD
Retailer 2$1,144 USD
Retailer 5$1,170 USD
Do Amore Diamonds$1,720 USD

26 data points across 11 retailers

15 retailers$200 USD to $1,720 USD

Retailer 1
-
$179 USD
Price last confirmed 30 days ago
A
Retailer 2
-
$200 USD
View
Final sale: no returns
Retailer 3
-
$210 USD
View
Price last confirmed 35 days ago
A
Retailer 4
-
$263 USD
View
B+
Retailer 5
-
$303 USD
View
A
Retailer 6
-
$405 USD
€386 EUR
View
A
Retailer 7
-
$492 USD
View
B+
Retailer 8
-
$628 USD
View
B+
Retailer 9
-
$793 USD
View
Retailer 10
-
$819 USD
View
Price last confirmed 32 days ago
B+
Retailer 11
-
$995 USD
View
B+
Retailer 12
-
$1,100 USD
View
B+
Retailer 13
-
$1,144 USD
£901 GBP
View
B
Retailer 14
-
$1,170 USD
View
Most Expensive
B
Do Amore Diamonds
27-93711A3C9 · Oct 31
$1,720 USD
View
14 more retailers have this diamond
Prices start from $200 USDSave up to $1,520 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
$200 USD