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Round|Natural|GIA

1.28ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 6167599134

Certificate GIA 6167599134

Diamond specifications and retailer prices

From $7,827 NZD
As of November 4, 2026
Save $7,763 NZD (50%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $15,590 NZD at MOH London · As of November 2, 2026
View at MOH London

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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6167599134. Listed at 6 retailers as of November 2, 2026, with prices from $7,827 to $15,590, a $7,763 spread on the same certified stone. MOH London lists it at $15,590. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6167599134
Dimensions6.93 × 6.97 × 4.36 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
6.93 mm6.97 mm1.28 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6167599134
Side View
Table 56.0%Crown 35.5°Girdle: THN-MEDPavilion 41.4°Culet: NoneDepth 62.7%

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 4
Current: $15,590 NZD|Low: $9,317 NZD|High: $15,778 NZD|Avg: $11,397 NZD
MOH London
Retailer 2
Retailer 3
Retailer 4
November 7, 2026
Retailer 2$9,395 NZD
Retailer 4$9,876 NZD
Retailer 3$10,369 NZD
MOH London$15,590 NZD

41 data points across 4 retailers

6 retailers$7,827 NZD to $15,590 NZD

B+
Cheapest Retailer
-
$7,827 NZD
B+
Retailer 2
-
$9,395 NZD
View
Retailer 3
-
$9,876 NZD
View
Price last confirmed 37 days ago
B
Retailer 4
-
$10,369 NZD
View
Retailer 5
-
$10,800 NZD
View
Price last confirmed 15 days ago
Most Expensive
B
MOH London
368F4F573 · Nov 2
$15,590 NZD
£6,805 GBP
View
5 more retailers have this diamond
Prices start from $7,827 NZDSave up to $7,763 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.

B+
1.28ct Round
$7,827 NZD