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Radiant|Lab Grown|IGI

1.28ct D FL Radiant Lab Grown Diamond

GD • D/FL

Diamond specifications and retailer prices

From $425 NZD
$239 USD
As of November 2, 2026
Save $2,895 NZD (87%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: $3,320 NZD at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 1.28ct lab-grown radiant diamond

This 1.28ct lab-grown radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a standard cut grade and certified by IGI. Listed at 5 retailers as of October 31, 2026, with prices from $425 to $3,320, a $2,895 spread on the same certified stone. Blue Nile lists it at $3,320. 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

1.28
Carat
D
Colour
FL
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions7.74 × 5.26 × 3.72 mm
L/W Ratio1.47
Top View
7.74 mm5.26 mm1.28 ctD / FL
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 62.0%CrownGirdle: MediumPavilionCulet: NoneDepth 70.7%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: $3,320 NZD|Low: $425 NZD|High: $4,781 NZD|Avg: $2,123 NZD
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 27, 2026
Retailer 2$425 NZD
Retailer 5$492 NZD
Retailer 3$956 NZD
Retailer 4$1,868 NZD
Blue Nile$3,320 NZD
Retailer 6$4,781 NZD

12 data points across 6 retailers

5 retailers$425 NZD to $3,320 NZD

A
Cheapest Retailer
-
$425 NZD
$239 USD
A
Retailer 2
-
$492 NZD
$277 USD
View
B+
Retailer 3
-
$956 NZD
$538 USD
View
B+
Retailer 4
-
$1,868 NZD
$1,051 USD
View
Most Expensive
C
Blue Nile
30353400 · Oct 31
$3,320 NZD
$1,868 USD
View
4 more retailers have this diamond
Prices start from $425 NZDSave up to $2,895 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
1.28ct Radiant
$425 NZD