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Cushion|Lab Grown|IGI

1.39ct D SI1 Cushion Lab Grown Diamond

GD • D/SI1 • IGI LG683579698

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG683579698

Diamond specifications and retailer prices

From $778 NZD
£345 GBP
As of October 30, 2026
Save $3,303 NZD (81%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $4,081 NZD at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 1.39ct lab-grown cushion diamond

This 1.39ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade and certified by IGI LG683579698 or 683579698. Listed at 8 retailers as of October 30, 2026, with prices from $778 to $4,081, a $3,303 spread on the same certified stone. Do Amore Diamonds lists it at $4,081. 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

1.39
Carat
D
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle37.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG683579698
Dimensions6.66 × 6.42 × 4.20 mm
L/W Ratio1.04
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
6.66 mm6.42 mm1.39 ctD / SI1
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG683579698
Side View
Table 57.0%Crown 36.3°Girdle: MED-STKPavilion 37.6°Culet: NoneDepth 65.4%

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: Oct 30
Current: $4,081 NZD|Low: $775 NZD|High: $4,205 NZD|Avg: $1,582 NZD
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 3$778 NZD
Retailer 2$861 NZD
Retailer 8$861 NZD
Retailer 6$972 NZD
Retailer 7$1,043 NZD
Retailer 9$1,186 NZD
Retailer 5$1,597 NZD
Retailer 4$2,609 NZD
Do Amore Diamonds$4,081 NZD

33 data points across 9 retailers

8 retailers$778 NZD to $4,081 NZD

A
Cheapest Retailer
-
$778 NZD
£345 GBP
B+
Retailer 2
-
$861 NZD
$485 USD
View
A
Retailer 3
-
$861 NZD
$485 USD
View
B+
Retailer 4
-
$972 NZD
$548 USD
View
B+
Retailer 5
-
$1,043 NZD
$588 USD
View
Retailer 6
-
$1,597 NZD
$900 USD
View
Price last confirmed 10 days ago
B
Retailer 7
-
$2,609 NZD
£1,158 GBP
View
Most Expensive
C
Do Amore Diamonds
7-1681876 · Oct 31
$4,081 NZD
$2,300 USD
View
7 more retailers have this diamond
Prices start from $778 NZDSave up to $3,303 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
1.39ct Cushion
$778 NZD