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Round|Natural|GIA

1.30ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 6542878509

Certificate GIA 6542878509

Diamond specifications and retailer prices

From $6,287 AUD
As of November 5, 2026
Save $4,944 AUD (44%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $12,425 AUD at NZ Jewellers · As of September 28, 2026
View at NZ Jewellers

About this 1.3ct natural round diamond

This 1.3ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6542878509. Listed at 10 retailers as of November 2, 2026, with a 79% 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

1.30
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6542878509
Dimensions6.90 × 6.95 × 4.33 mm
L/W Ratio1.01
Top View
6.90 mm6.95 mm1.30 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 6542878509
Side View
Table 58.0%Crown 36°GirdlePavilion 40.8°CuletDepth 62.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $6,287 AUD|Low: $6,270 AUD|High: $11,495 AUD|Avg: $7,825 AUD|-0.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 5, 2026
Retailer 1$6,287 AUD
Retailer 2$6,746 AUD
Retailer 3$6,784 AUD
Retailer 5$7,111 AUD
Retailer 4$11,231 AUD

43 data points across 5 retailers

10 retailers$6,287 AUD to $11,231 AUD

A
Cheapest Retailer
-
$6,287 AUD
A
Retailer 2
-
$6,746 AUD
View
A
Retailer 3
-
$6,784 AUD
View
Retailer 4
-
$7,054 AUD
View
Price last confirmed 29 days ago
Retailer 5
-
$7,054 AUD
View
Price last confirmed 38 days ago
Retailer 6
-
$7,111 AUD
View
Price last confirmed 28 days ago
Retailer 7
-
$7,131 AUD
View
Price last confirmed 41 days ago
B
Retailer 8
-
$11,231 AUD
View
Retailer 9
-
$12,291 AUD
View
Price last confirmed 34 days ago
Most Expensive
NZ Jewellers
ac875d9b-e803-49d7-b842-a9539e9bc1ae · Sep 28
$12,425 AUD
$8,537 USD
View
Price last confirmed 39 days ago
9 more retailers have this diamond
Prices start from $6,287 AUDSave up to $4,944 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
1.30ct Round
$6,287 AUD