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1.31ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1519325608

Certificate GIA 1519325608

Diamond specifications and retailer prices

From $4,387 USD
As of November 1, 2026
Save $4,899 USD (53%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $9,286 USD at NZ Jewellers · As of November 2, 2026
View at NZ Jewellers

About this 1.31ct natural round diamond

This 1.31ct 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 1519325608. Listed at 16 retailers as of November 1, 2026, with prices from $4,387 to $9,286, a $4,899 spread on the same certified stone. NZ Jewellers lists it at $9,286. 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

1.31
Carat
I
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1519325608
Dimensions6.99 × 6.96 × 4.35 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Cert comments
Additional clouds are not shown. Pinpoints are not shown.
Top View
6.99 mm6.96 mm1.31 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1519325608
Side View
Table 56.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.4%

Caratlytics Score

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

Price History

Last verified: Nov 1
Current: $5,382 USD|Low: $3,869 USD|High: $8,950 USD|Avg: $5,932 USD|+0.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 2, 2026
Retailer 4$4,455 USD
Retailer 6$4,643 USD
Retailer 8$5,030 USD
Retailer 1$5,382 USD
Retailer 7$5,561 USD
Retailer 2$6,256 USD
Retailer 3$6,825 USD
Retailer 5$8,891 USD

44 data points across 8 retailers

16 retailers$4,387 USD to $9,286 USD

B+
Cheapest Retailer
-
$4,387 USD
B+
Retailer 2
-
$4,455 USD
View
B+
Retailer 3
-
$4,643 USD
View
Final sale: no returns
B
Retailer 4
-
$4,983 USD
View
B
Retailer 5
-
$5,030 USD
View
B
Retailer 6
-
$5,030 USD
View
B
Retailer 7
-
$5,030 USD
View
B+
Retailer 8
-
$5,324 USD
View
B+
Retailer 9
-
$5,382 USD
£4,238 GBP
View
Retailer 10
-
$5,561 USD
A$8,556 AUD
View
Price last confirmed 24 days ago
B
Retailer 11
-
$5,804 USD
View
Retailer 12
-
$6,126 USD
View
Price last confirmed 10 days ago
B
Retailer 13
-
$6,256 USD
€5,958 EUR
View
B
Retailer 14
-
$6,825 USD
ZAR 110,259 ZAR
View
B
Retailer 15
-
$8,891 USD
£7,001 GBP
View
Most Expensive
B
NZ Jewellers
453e8bd4-76ab-4f83-ae35-d2c612b6d1e4 · Nov 2
$9,286 USD
View
15 more retailers have this diamond
Prices start from $4,387 USDSave up to $4,899 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.

B+
1.31ct Round
$4,387 USD