CaratHunter
Plans
Round|Natural|IGI

1.28ct M SI1 Round Natural Diamond

EX • M/SI1 • IGI 726509637

Shape and cutting style on the report: Round brilliant

Certificate IGI 726509637

Diamond specifications and retailer prices

From $1,784 AUD
As of October 30, 2026
Save $513 AUD (22%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $4,111 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.28ct natural round diamond

This 1.28ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 726509637. Listed at 7 retailers as of October 30, 2026, with a 29% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.1°
Pavilion angle40.7°
OriginNatural
Grading LabIGI
CertificateIGI 726509637
Dimensions6.90 × 6.91 × 4.33 mm
L/W Ratio1.00
Culet sizePointed
Top View
6.90 mm6.91 mm1.28 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 726509637
Side View
Table 57.0%Crown 36.1°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 62.8%

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: $4,111 AUD|Low: $1,264 AUD|High: $4,111 AUD|Avg: $2,061 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8$1,264 AUD
Retailer 3$1,671 AUD
Retailer 5$1,686 AUD
Retailer 4$1,751 AUD
Retailer 6$1,784 AUD
Retailer 7$1,864 AUD
Retailer 2$2,297 AUD
NZ Jewellers$4,111 AUD

33 data points across 8 retailers

7 retailers$1,784 AUD to $2,297 AUD

Retailer 1
-
$1,671 AUD
Price last confirmed 7 days ago
Retailer 2
-
$1,686 AUD
View
Price last confirmed 8 days ago
Retailer 3
-
$1,751 AUD
View
Price last confirmed 8 days ago
A
Retailer 4
-
$1,784 AUD
View
Retailer 5
-
$1,864 AUD
View
Price last confirmed 6 days ago
A
Retailer 6
-
$2,297 AUD
View
Most Expensive
NZ Jewellers
47ac3e65-5c01-45f2-a94c-bb7beb97ae69 · Oct 30
$4,111 AUD
$2,878 USD
View
Price last confirmed 7 days ago
6 more retailers have this diamond
Prices start from $1,784 AUDSave up to $513 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.

A
1.28ct Round
$1,784 AUD