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Cushion|Lab Grown|IGI

4.21ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780662156

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG780662156

Diamond specifications and retailer prices

From HK$32,144 HKD
$4,097 USD
As of October 29, 2026
Save HK$70,211 HKD (69%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: HK$102,355 HKD at Frank Darling · As of October 31, 2026
View at Frank Darling

About this 4.21ct lab-grown cushion diamond

This 4.21ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780662156 or 780662156. Listed at 10 retailers as of October 29, 2026, with prices from HK$32,144 to HK$102,355, a HK$70,211 spread on the same certified stone. Frank Darling lists it at HK$102,355. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

4.21
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle42.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780662156
Dimensions10.81 × 8.68 × 5.88 mm
L/W Ratio1.25
Girdle conditionFaceted
Culet sizeLarge
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
10.81 mm8.68 mm4.21 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780662156
Side View
Table 56.0%Crown 36.5°Girdle: STK-THKPavilion 42.7°Culet: LargeDepth 67.7%

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: Oct 29
Current: HK$102,355 HKD|Low: HK$32,144 HKD|High: HK$275,796 HKD|Avg: HK$111,811 HKD|-42.1%
Frank Darling
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
November 1, 2026
Retailer 14HK$32,144 HKD
Retailer 13HK$33,682 HKD
Retailer 15HK$48,714 HKD
Retailer 12HK$49,451 HKD
Retailer 10HK$51,429 HKD
Retailer 3HK$54,802 HKD
Retailer 8HK$57,721 HKD
Retailer 11HK$66,610 HKD
Retailer 9HK$70,707 HKD
Retailer 2HK$85,212 HKD
Retailer 6HK$94,843 HKD
Frank DarlingHK$102,355 HKD
Retailer 4HK$178,882 HKD
Retailer 7HK$233,226 HKD
Retailer 5HK$275,796 HKD

33 data points across 15 retailers

10 retailersHK$32,144 HKD to HK$102,355 HKD

A
Cheapest Retailer
-
HK$32,144 HKD
$4,097 USD
A
Retailer 2
-
HK$33,682 HKD
$4,293 USD
View
A
Retailer 3
-
HK$48,714 HKD
$6,209 USD
View
Final sale: no returns
A
Retailer 4
-
HK$49,451 HKD
$6,303 USD
View
A
Retailer 5
-
HK$51,429 HKD
$6,555 USD
View
A
Retailer 6
-
HK$57,721 HKD
$7,357 USD
View
A
Retailer 7
-
HK$66,610 HKD
$8,490 USD
View
B+
Retailer 8
-
HK$70,707 HKD
€8,583 EUR
View
B+
Retailer 9
-
HK$85,212 HKD
£8,552 GBP
View
Most Expensive
B+
Frank Darling
CR16-4EL · Oct 31
HK$102,355 HKD
$13,046 USD
View
9 more retailers have this diamond
Prices start from HK$32,144 HKDSave up to HK$70,211 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
4.21ct Cushion
HK$32,144 HKD