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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 $1,270 SGD
As of November 5, 2026
Save $1,491 SGD (54%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $2,760 SGD 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 $1,270 to $2,760, a $1,491 spread on the same certified stone. NZ Jewellers lists it at $2,760. 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: $1,270 SGD|Low: $1,219 SGD|High: $1,699 SGD|Avg: $1,488 SGD|+4.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
October 10, 2026
Retailer 1$1,270 SGD
Retailer 2$1,473 SGD
Retailer 3$1,473 SGD
Retailer 4$1,699 SGD

4 data points across 4 retailers

6 retailers$1,270 SGD to $2,760 SGD

B+
Cheapest Retailer
-
$1,270 SGD
B+
Retailer 2
-
$1,381 SGD
View
Retailer 3
-
$1,473 SGD
View
Price last confirmed 25 days ago
B+
Retailer 4
-
$1,473 SGD
View
B
Retailer 5
-
$1,699 SGD
View
Most Expensive
B
NZ Jewellers
d0d0c59d-6355-48e4-9a2d-b1eb0d6a1d50 · Nov 5
$2,760 SGD
$2,161 USD
View
5 more retailers have this diamond
Prices start from $1,270 SGDSave up to $1,491 SGD

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
$1,270 SGD