Round|Natural|GIA

1.28ct I I1 Round Natural Diamond

EX • I/I1 • GIA 1159768185

Certificate GIA 1159768185

Diamond specifications and retailer prices

From $2,364 USD
As of November 1, 2026
Save $918 USD (28%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $5,520 USD at NZ Jewellers · As of September 28, 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 I colour (near-colourless) and I1 clarity (included), with a top-tier cut grade and certified by GIA 1159768185. Listed at 10 retailers as of November 1, 2026, with a 39% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.28
Carat
I
Color
I1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceFaint
Crown angle34°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1159768185
Dimensions6.97 × 6.99 × 4.28 mm
L/W Ratio1.00
Star length55%
Lower girdle80%
Top View
6.97 mm6.99 mm1.28 ctI / I1
OriginNatural
CutExcellent
PolishVery Good
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1159768185
Side View
Table 59.0%Crown 34°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 61.3%

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: Nov 1
Current: $3,282 USD|Low: $2,030 USD|High: $3,297 USD|Avg: $2,667 USD|+2.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 1, 2026
Retailer 7$2,030 USD
Retailer 2$2,364 USD
Retailer 4$2,429 USD
Retailer 3$2,640 USD
Retailer 5$2,783 USD
Retailer 6$3,142 USD
Retailer 1$3,282 USD

18 data points across 7 retailers

10 retailers$2,364 USD to $3,282 USD

A
Cheapest Retailer
-
$2,364 USD
A
Retailer 2
-
$2,429 USD
View
B+
Retailer 3
-
$2,640 USD
View
Retailer 4
-
$2,640 USD
View
Price last confirmed 25 days ago
B+
Retailer 5
-
$2,742 USD
View
Retailer 6
-
$2,742 USD
View
Price last confirmed 33 days ago
B+
Retailer 7
-
$2,783 USD
View
Retailer 8
-
$3,047 USD
View
Price last confirmed 23 days ago
B
Retailer 9
-
$3,282 USD
€3,126 EUR
View
Most Expensive
NZ Jewellers
a599cf4d-8480-4cf6-bace-2f5c2fdad13f · Sep 28
$5,520 USD
View
Price last confirmed 35 days ago
9 more retailers have this diamond
Prices start from $2,364 USDSave up to $918 USD

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
$2,364 USD