CaratHunter
Plans
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 HK$1,836 HKD
As of November 4, 2026
Save HK$13,620 HKD (88%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: HK$15,456 HKD 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 HK$1,836 to HK$15,456, a HK$13,620 spread on the same certified stone. Brilliant Earth lists it at HK$15,456. 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: HK$15,456 HKD|Low: HK$1,757 HKD|High: HK$19,301 HKD|Avg: HK$5,548 HKD|-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 4, 2026
Retailer 15HK$1,836 HKD
Retailer 8HK$2,040 HKD
Retailer 5HK$2,126 HKD
Retailer 6HK$2,275 HKD
Retailer 16HK$2,275 HKD
Retailer 12HK$3,774 HKD
Retailer 4HK$3,852 HKD
Retailer 10HK$3,923 HKD
Retailer 7HK$4,150 HKD
Retailer 2HK$4,245 HKD
Retailer 9HK$5,563 HKD
Retailer 3HK$7,304 HKD
Retailer 14HK$7,328 HKD
Retailer 11HK$9,101 HKD
Retailer 13HK$14,476 HKD
Brilliant EarthHK$15,456 HKD

44 data points across 16 retailers

21 retailersHK$1,836 HKD to HK$15,456 HKD

A
Cheapest Retailer
-
HK$1,836 HKD
A
Retailer 2
-
HK$2,040 HKD
View
Final sale: no returns
A
Retailer 3
-
HK$2,126 HKD
View
Retailer 4
-
HK$2,275 HKD
View
Price last confirmed 10 days ago
A
Retailer 5
-
HK$2,275 HKD
View
A
Retailer 6
-
HK$2,511 HKD
View
A
Retailer 7
-
HK$3,774 HKD
View
A
Retailer 8
-
HK$3,852 HKD
View
A
Retailer 9
-
HK$3,923 HKD
View
A
Retailer 10
-
HK$4,150 HKD
View
A
Retailer 11
-
HK$4,245 HKD
View
A
Retailer 12
-
HK$5,563 HKD
View
B+
Retailer 13
-
HK$5,986 HKD
View
B+
Retailer 14
-
HK$7,304 HKD
View
B+
Retailer 15
-
HK$7,328 HKD
View
B+
Retailer 16
-
HK$7,344 HKD
View
B+
Retailer 17
-
HK$7,712 HKD
View
B+
Retailer 18
-
HK$9,101 HKD
View
B
Retailer 19
-
HK$10,200 HKD
View
Retailer 20
-
HK$14,476 HKD
View
Price last confirmed 17 days ago
Most Expensive
B
Brilliant Earth
19340393A · Nov 4
HK$15,456 HKD
$1,970 USD
View
20 more retailers have this diamond
Prices start from HK$1,836 HKDSave up to HK$13,620 HKD

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
HK$1,836 HKD