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Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

EX • D/IF • IGI LG780696509

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

Certificate IGI LG780696509

Diamond specifications and retailer prices

From $334 AUD
As of November 4, 2026
Save $2,480 AUD (88%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $2,814 AUD at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

About this 1.21ct lab-grown radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780696509 or 780696509. Listed at 21 retailers as of November 4, 2026, with prices from $334 to $2,814, a $2,480 spread on the same certified stone. Brilliant Earth lists it at $2,814. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle28°
Pavilion angle35.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780696509
Dimensions7.62 × 5.24 × 3.48 mm
L/W Ratio1.45
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
7.62 mm5.24 mm1.21 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780696509
Side View
Table 62.0%Crown 28°Girdle: MediumPavilion 35.5°Culet: NoneDepth 66.4%

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 4
Current: $2,814 AUD|Low: $320 AUD|High: $3,514 AUD|Avg: $1,013 AUD|-19.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
November 6, 2026
Retailer 15$334 AUD
Retailer 8$371 AUD
Retailer 5$387 AUD
Retailer 6$414 AUD
Retailer 16$414 AUD
Retailer 12$687 AUD
Retailer 4$701 AUD
Retailer 10$714 AUD
Retailer 7$756 AUD
Retailer 2$773 AUD
Retailer 9$1,013 AUD
Retailer 3$1,330 AUD
Retailer 14$1,334 AUD
Retailer 11$1,657 AUD
Retailer 13$2,636 AUD
Brilliant Earth$2,814 AUD

46 data points across 16 retailers

21 retailers$334 AUD to $2,814 AUD

A
Cheapest Retailer
-
$334 AUD
A
Retailer 2
-
$371 AUD
View
Final sale: no returns
A
Retailer 3
-
$387 AUD
View
Retailer 4
-
$414 AUD
View
Price last confirmed 12 days ago
A
Retailer 5
-
$414 AUD
View
A
Retailer 6
-
$457 AUD
View
A
Retailer 7
-
$687 AUD
View
A
Retailer 8
-
$701 AUD
View
A
Retailer 9
-
$714 AUD
View
A
Retailer 10
-
$756 AUD
View
A
Retailer 11
-
$773 AUD
View
A
Retailer 12
-
$1,013 AUD
View
B+
Retailer 13
-
$1,090 AUD
View
B+
Retailer 14
-
$1,330 AUD
View
B+
Retailer 15
-
$1,334 AUD
View
B+
Retailer 16
-
$1,337 AUD
View
B+
Retailer 17
-
$1,404 AUD
View
B+
Retailer 18
-
$1,657 AUD
View
B
Retailer 19
-
$1,857 AUD
View
Retailer 20
-
$2,636 AUD
View
Price last confirmed 19 days ago
Most Expensive
B
Brilliant Earth
19340393A · Nov 4
$2,814 AUD
$1,970 USD
View
20 more retailers have this diamond
Prices start from $334 AUDSave up to $2,480 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
1.21ct Radiant
$334 AUD