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Cushion|Lab Grown|IGI

6.39ct F VVS1 Cushion Lab Grown Diamond

EX • F/VVS1 • IGI LG670463837

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG670463837

Diamond specifications and retailer prices

From $4,632 NZD
$2,606 USD
As of November 1, 2026
Save $15,594 NZD (77%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $26,766 NZD at Brilliant Earth · As of October 18, 2026
View at Brilliant Earth

About this 6.39ct lab-grown cushion diamond

This 6.39ct lab-grown cushion sits in the over five carat band, graded F colour (colourless) and VVS1 clarity (very-very-slightly-included), with a top-tier cut grade and certified by IGI LG670463837 or 670463837. Listed at 5 retailers as of November 1, 2026, with a 337% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

6.39
Carat
F
Colour
VVS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle38°
OriginLab Grown
Grading LabIGI
CertificateIGI LG670463837
Dimensions12.62 × 10.12 × 6.53 mm
L/W Ratio1.25
Girdle conditionFaceted
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
12.62 mm10.12 mm6.39 ctF / VVS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG670463837
Side View
Table 62.0%Crown 35.4°Girdle: MED-STKPavilion 38°Culet: NoneDepth 64.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: $26,766 NZD|Low: $4,632 NZD|High: $65,400 NZD|Avg: $19,735 NZD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 3, 2026
Retailer 4$4,632 NZD
Retailer 8$4,834 NZD
Retailer 7$7,287 NZD
Retailer 2$8,878 NZD
Retailer 10$9,214 NZD
Retailer 5$11,670 NZD
Retailer 6$13,998 NZD
Retailer 11$17,651 NZD
Brilliant Earth$26,766 NZD
Retailer 9$41,607 NZD
Retailer 3$65,400 NZD

2 data points across 11 retailers

5 retailers$4,632 NZD to $20,226 NZD

A
Cheapest Retailer
-
$4,632 NZD
$2,606 USD
Retailer 2
-
$8,878 NZD
$4,995 USD
View
Retailer 3
-
$11,670 NZD
$6,566 USD
View
Price last confirmed 91 days ago
B
Retailer 4
-
$20,226 NZD
$11,380 USD
View
Most Expensive
Brilliant Earth
17792836Y · Oct 18
$26,766 NZD
$15,060 USD
View
Price last confirmed 15 days ago
4 more retailers have this diamond
Prices start from $4,632 NZDSave up to $15,594 NZD

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
6.39ct Cushion
$4,632 NZD