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Cushion|Lab Grown|IGI

1.51ct E IF Cushion Lab Grown Diamond

VG • E/IF • IGI LG638415688

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG638415688

Diamond specifications and retailer prices

From HK$5,162 HKD
$658 USD
As of October 31, 2026
Save HK$20,258 HKD (80%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: HK$25,420 HKD at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.51ct lab-grown cushion diamond

This 1.51ct lab-grown cushion sits in the one-and-a-half to two carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG638415688 or 638415688. Listed at 19 retailers as of October 30, 2026, with prices from HK$5,162 to HK$25,420, a HK$20,258 spread on the same certified stone. Brilliant Earth lists it at HK$25,420. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
E
Colour
IF
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle39.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG638415688
Dimensions6.67 × 6.60 × 4.47 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.67 mm6.60 mm1.51 ctE / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG638415688
Side View
Table 60.0%Crown 36.5°Girdle: MED-STKPavilion 39.7°Culet: NoneDepth 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 31
Current: HK$25,420 HKD|Low: HK$5,162 HKD|High: HK$25,734 HKD|Avg: HK$12,744 HKD|-1.2%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 1, 2026
Retailer 6HK$5,162 HKD
Retailer 3HK$5,720 HKD
Retailer 11HK$6,590 HKD
Retailer 4HK$7,375 HKD
Retailer 2HK$8,863 HKD
Retailer 5HK$9,540 HKD
Retailer 9HK$9,825 HKD
Retailer 7HK$13,315 HKD
Retailer 12HK$17,292 HKD
Retailer 10HK$19,144 HKD
Retailer 8HK$24,950 HKD
Brilliant EarthHK$25,420 HKD

42 data points across 12 retailers

19 retailersHK$5,162 HKD to HK$25,420 HKD

A
Cheapest Retailer
-
HK$5,162 HKD
$658 USD
Final sale: no returns
Retailer 2
-
HK$5,720 HKD
$729 USD
View
Price last confirmed 16 days ago
A
Retailer 3
-
HK$6,590 HKD
$840 USD
View
A
Retailer 4
-
HK$7,375 HKD
$940 USD
View
A
Retailer 5
-
HK$7,650 HKD
$975 USD
View
A
Retailer 6
-
HK$8,748 HKD
$1,115 USD
View
A
Retailer 7
-
HK$8,863 HKD
£889 GBP
View
A
Retailer 8
-
HK$9,540 HKD
€1,158 EUR
View
A
Retailer 9
-
HK$9,825 HKD
ZAR 20,230 ZAR
View
B+
Retailer 10
-
HK$13,315 HKD
A$2,611 AUD
View
B
Retailer 11
-
HK$16,620 HKD
£1,668 GBP
View
B
Retailer 12
-
HK$17,292 HKD
$2,204 USD
View
B
Retailer 13
-
HK$18,241 HKD
$2,325 USD
View
B
Retailer 14
-
HK$18,503 HKD
$2,358 USD
View
B
Retailer 15
-
HK$18,861 HKD
$2,404 USD
View
Retailer 16
-
HK$19,144 HKD
$2,440 USD
View
Price last confirmed 11 days ago
B
Retailer 17
-
HK$22,753 HKD
$2,900 USD
View
B
Retailer 18
-
HK$24,950 HKD
£2,504 GBP
View
Most Expensive
B
Brilliant Earth
12444282A · Oct 30
HK$25,420 HKD
$3,240 USD
View
18 more retailers have this diamond
Prices start from HK$5,162 HKDSave up to HK$20,258 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
1.51ct Cushion
HK$5,162 HKD