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Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566054289

Certificate GIA 2566054289

Diamond specifications and retailer prices

From $7,823 AUD
$5,502 USD
As of October 27, 2026
Save $6,450 AUD (45%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $16,463 AUD at NZ Jewellers · As of September 28, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566054289. Listed at 19 retailers as of October 27, 2026, with a 82% 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

1.51
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2566054289
Dimensions7.28 × 7.32 × 4.59 mm
L/W Ratio1.01
Star length50%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Knot, Feather, Needle
Top View
7.28 mm7.32 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566054289
Side View
Table 56.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.8%

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: Oct 27
Current: $9,674 AUD|Low: $7,823 AUD|High: $14,678 AUD|Avg: $9,995 AUD|+4.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
October 29, 2026
Retailer 2$7,823 AUD
Retailer 5$8,048 AUD
Retailer 10$8,057 AUD
Retailer 3$8,157 AUD
Retailer 6$8,517 AUD
Retailer 16$8,574 AUD
Retailer 8$9,086 AUD
Retailer 4$9,088 AUD
Retailer 7$9,399 AUD
Retailer 9$9,399 AUD
Retailer 1$9,674 AUD
Retailer 15$9,888 AUD
Retailer 11$10,539 AUD
Retailer 13$10,863 AUD
Retailer 14$12,405 AUD
Retailer 12$14,273 AUD

40 data points across 16 retailers

19 retailers$7,823 AUD to $14,273 AUD

A
Cheapest Retailer
-
$7,823 AUD
$5,502 USD
B+
Retailer 2
-
$8,048 AUD
$5,660 USD
View
B+
Retailer 3
-
$8,057 AUD
$5,666 USD
View
B+
Retailer 4
-
$8,157 AUD
$5,737 USD
View
B+
Retailer 5
-
$8,517 AUD
$5,990 USD
View
Final sale: no returns
B+
Retailer 6
-
$8,574 AUD
$6,030 USD
View
B+
Retailer 7
-
$9,088 AUD
$6,391 USD
View
B+
Retailer 8
-
$9,399 AUD
$6,610 USD
View
B+
Retailer 9
-
$9,399 AUD
$6,610 USD
View
Price last confirmed 14 days ago
B+
Retailer 10
-
$9,674 AUD
£5,357 GBP
View
B+
Retailer 11
-
$9,844 AUD
$6,923 USD
View
Price last confirmed 21 days ago
B+
Retailer 12
-
$9,888 AUD
View
Price last confirmed 7 days ago
B+
Retailer 13
-
$9,995 AUD
$7,029 USD
View
Price last confirmed 29 days ago
B+
Retailer 14
-
$10,539 AUD
£5,836 GBP
View
B+
Retailer 15
-
$10,863 AUD
€7,276 EUR
View
B
Retailer 16
-
$11,358 AUD
$7,988 USD
View
Price last confirmed 29 days ago
B
Retailer 17
-
$12,405 AUD
ZAR 140,945 ZAR
View
B
Retailer 18
-
$14,273 AUD
£7,904 GBP
View
Most Expensive
B
NZ Jewellers
2cc99845-ad31-4206-9a33-efb150097eb4 · Sep 28
$16,463 AUD
$11,578 USD
View
Price last confirmed 31 days ago
18 more retailers have this diamond
Prices start from $7,823 AUDSave up to $6,450 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
1.51ct Round
$7,823 AUD