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Radiant|Natural|GIA

1.31ct I SI1 Radiant Natural Diamond

EX • I/SI1 • GIA 1559553399

Certificate GIA 1559553399

Diamond specifications and retailer prices

From $3,921 AUD
£2,164 GBP
As of November 2, 2026
Save $4,482 AUD (53%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: $8,403 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.31ct natural radiant diamond

This 1.31ct natural radiant 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 stated by the retailer rather than the lab and certified by GIA 1559553399. Listed at 8 retailers as of October 30, 2026, with prices from $3,921 to $8,403, a $4,482 spread on the same certified stone. NZ Jewellers lists it at $8,403. 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
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceStrong
Crown angle49.51°
Pavilion angle37.35°
OriginNatural
Grading LabGIA
CertificateGIA 1559553399
Dimensions7.23 × 5.57 × 3.76 mm
L/W Ratio1.30
Girdle conditionThick
Key to symbols
Crystal, Feather, Cloud
Top View
7.23 mm5.57 mm1.31 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceStrong
CertificateGIA 1559553399
Side View
Table 71.0%Crown 49.51°GirdlePavilion 37.35°CuletDepth 67.6%

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 2
Current: $8,403 AUD|Low: $3,921 AUD|High: $8,487 AUD|Avg: $5,162 AUD|-1.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 2$3,921 AUD
Retailer 5$4,020 AUD
Retailer 6$4,045 AUD
Retailer 4$4,174 AUD
Retailer 7$4,181 AUD
Retailer 8$4,526 AUD
Retailer 9$4,830 AUD
Retailer 3$7,042 AUD
NZ Jewellers$8,403 AUD

38 data points across 9 retailers

8 retailers$3,921 AUD to $8,403 AUD

A
Cheapest Retailer
-
$3,921 AUD
£2,164 GBP
A
Retailer 2
-
$4,020 AUD
$2,817 USD
View
A
Retailer 3
-
$4,045 AUD
$2,835 USD
View
A
Retailer 4
-
$4,174 AUD
$2,925 USD
View
A
Retailer 5
-
$4,181 AUD
$2,930 USD
View
Retailer 6
-
$4,526 AUD
View
Price last confirmed 26 days ago
B
Retailer 7
-
$7,042 AUD
£3,886 GBP
View
Most Expensive
B
NZ Jewellers
12847545-be5a-4205-b170-7784169fc6de · Oct 30
$8,403 AUD
$5,889 USD
View
7 more retailers have this diamond
Prices start from $3,921 AUDSave up to $4,482 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
1.31ct Radiant
$3,921 AUD