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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 $285 AUD
$200 USD
As of November 1, 2026
Save $2,169 AUD (88%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $2,454 AUD at Do Amore Diamonds · As of November 2, 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 November 1, 2026, with prices from $285 to $2,454, a $2,169 spread on the same certified stone. Do Amore Diamonds lists it at $2,454. 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
Colour
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: $2,454 AUD|Low: $265 AUD|High: $2,554 AUD|Avg: $1,117 AUD|+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 2, 2026
Retailer 8$285 AUD
Retailer 11$376 AUD
Retailer 7$432 AUD
Retailer 5$578 AUD
Retailer 10$702 AUD
Retailer 2$909 AUD
Retailer 9$1,132 AUD
Retailer 3$1,570 AUD
Retailer 4$1,633 AUD
Retailer 6$1,669 AUD
Do Amore Diamonds$2,454 AUD

26 data points across 11 retailers

15 retailers$285 AUD to $2,454 AUD

Retailer 1
-
$255 AUD
$179 USD
Price last confirmed 31 days ago
A
Retailer 2
-
$285 AUD
$200 USD
View
Final sale: no returns
Retailer 3
-
$300 AUD
$210 USD
View
Price last confirmed 36 days ago
A
Retailer 4
-
$376 AUD
$263 USD
View
B+
Retailer 5
-
$432 AUD
$303 USD
View
A
Retailer 6
-
$578 AUD
€386 EUR
View
A
Retailer 7
-
$702 AUD
$492 USD
View
A
Retailer 8
-
$909 AUD
$637 USD
View
B+
Retailer 9
-
$1,132 AUD
$793 USD
View
Retailer 10
-
$1,169 AUD
$819 USD
View
Price last confirmed 33 days ago
B+
Retailer 11
-
$1,420 AUD
$995 USD
View
B+
Retailer 12
-
$1,570 AUD
$1,100 USD
View
B+
Retailer 13
-
$1,633 AUD
£901 GBP
View
B
Retailer 14
-
$1,669 AUD
$1,170 USD
View
Most Expensive
B
Do Amore Diamonds
27-93711A3C9 · Nov 2
$2,454 AUD
$1,720 USD
View
14 more retailers have this diamond
Prices start from $285 AUDSave up to $2,169 AUD

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
$285 AUD