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Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780662186

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG780662186

Diamond specifications and retailer prices

From HK$32,073 HKD
$4,088 USD
As of October 29, 2026
Save HK$70,045 HKD (69%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: HK$102,118 HKD at Frank Darling · As of October 31, 2026
View at Frank Darling

About this 4.2ct lab-grown cushion diamond

This 4.2ct 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 LG780662186 or 780662186. Listed at 10 retailers as of October 29, 2026, with prices from HK$32,073 to HK$102,118, a HK$70,045 spread on the same certified stone. Frank Darling lists it at HK$102,118. 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

4.20
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.6°
Pavilion angle41.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780662186
Dimensions10.92 × 8.47 × 5.81 mm
L/W Ratio1.29
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
10.92 mm8.47 mm4.20 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780662186
Side View
Table 53.0%Crown 36.6°Girdle: THK-VTKPavilion 41.9°Culet: LargeDepth 68.6%

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$102,118 HKD|Low: HK$32,073 HKD|High: HK$275,153 HKD|Avg: HK$111,561 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$32,073 HKD
Retailer 13HK$33,611 HKD
Retailer 15HK$48,604 HKD
Retailer 12HK$49,342 HKD
Retailer 10HK$51,311 HKD
Retailer 3HK$54,669 HKD
Retailer 8HK$57,603 HKD
Retailer 11HK$66,453 HKD
Retailer 9HK$70,542 HKD
Retailer 2HK$85,023 HKD
Retailer 6HK$94,618 HKD
Frank DarlingHK$102,118 HKD
Retailer 4HK$178,411 HKD
Retailer 7HK$232,890 HKD
Retailer 5HK$275,153 HKD

33 data points across 15 retailers

10 retailersHK$32,073 HKD to HK$102,118 HKD

A
Cheapest Retailer
-
HK$32,073 HKD
$4,088 USD
A
Retailer 2
-
HK$33,611 HKD
$4,284 USD
View
A
Retailer 3
-
HK$48,604 HKD
$6,195 USD
View
Final sale: no returns
A
Retailer 4
-
HK$49,342 HKD
$6,289 USD
View
A
Retailer 5
-
HK$51,311 HKD
$6,540 USD
View
A
Retailer 6
-
HK$57,603 HKD
$7,342 USD
View
A
Retailer 7
-
HK$66,453 HKD
$8,470 USD
View
B+
Retailer 8
-
HK$70,542 HKD
€8,563 EUR
View
B+
Retailer 9
-
HK$85,023 HKD
£8,533 GBP
View
Most Expensive
B+
Frank Darling
P82L-18EL · Oct 31
HK$102,118 HKD
$13,016 USD
View
9 more retailers have this diamond
Prices start from HK$32,073 HKDSave up to HK$70,045 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
4.20ct Cushion
HK$32,073 HKD