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Round|Lab Grown|IGI

1.28ct K SI1 Round Lab Grown Diamond

ID • K/SI1 • IGI LG400908960

Shape and cutting style on the report: Round brilliant

Certificate IGI LG400908960

Diamond specifications and retailer prices

From $1,420 AUD
As of November 5, 2026
Save $1,667 AUD (54%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $3,087 AUD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.28ct lab-grown round diamond

This 1.28ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG400908960 or 400908960. Listed at 6 retailers as of November 5, 2026, with prices from $1,420 to $3,087, a $1,667 spread on the same certified stone. NZ Jewellers lists it at $3,087. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.28
Carat
K
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.2°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG400908960
Dimensions7.02 × 7.07 × 4.20 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory grown diamond was created by chemical vapor deposition process (CVD) Type IIa
Top View
7.02 mm7.07 mm1.28 ctK / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG400908960
Side View
Table 59.5%Crown 33.2°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 59.7%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $1,420 AUD|Low: $1,363 AUD|High: $1,900 AUD|Avg: $1,664 AUD|+4.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
October 10, 2026
Retailer 1$1,420 AUD
Retailer 2$1,647 AUD
Retailer 3$1,647 AUD
Retailer 4$1,900 AUD

4 data points across 4 retailers

6 retailers$1,420 AUD to $3,087 AUD

B+
Cheapest Retailer
-
$1,420 AUD
B+
Retailer 2
-
$1,544 AUD
View
Retailer 3
-
$1,647 AUD
View
Price last confirmed 25 days ago
B+
Retailer 4
-
$1,647 AUD
View
B
Retailer 5
-
$1,900 AUD
View
Most Expensive
B
NZ Jewellers
d0d0c59d-6355-48e4-9a2d-b1eb0d6a1d50 · Nov 5
$3,087 AUD
$2,161 USD
View
5 more retailers have this diamond
Prices start from $1,420 AUDSave up to $1,667 AUD

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.

B+
1.28ct Round
$1,420 AUD