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Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

GD • I/SI1 • GIA 2557750890

Certificate GIA 2557750890

Diamond specifications and retailer prices

From $3,736 AUD
HK$20,500 HKD
As of October 31, 2026
Save $4,961 AUD (57%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $8,697 AUD at NZ Jewellers · As of October 27, 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 standard cut grade and certified by GIA 2557750890. Listed at 18 retailers as of October 27, 2026, with prices from $3,736 to $8,697, a $4,961 spread on the same certified stone. NZ Jewellers lists it at $8,697. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
I
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryVery Good
FluorescenceMedium
Crown angle40°
Pavilion angle40.4°
OriginNatural
Grading LabGIA
CertificateGIA 2557750890
Dimensions7.00 × 6.92 × 4.67 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Top View
7.00 mm6.92 mm1.51 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 2557750890
Side View
Table 57.0%Crown 40°Girdle: THK-VTKPavilion 40.4°Culet: NoneDepth 67.1%

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 31
Current: $8,697 AUD|Low: $3,699 AUD|High: $8,954 AUD|Avg: $5,481 AUD|-2.9%
NZ Jewellers
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
Retailer 17
October 31, 2026
Retailer 10$3,736 AUD
Retailer 12$3,842 AUD
Retailer 3$4,168 AUD
Retailer 11$4,598 AUD
Retailer 16$4,598 AUD
Retailer 17$4,607 AUD
Retailer 5$4,991 AUD
Retailer 15$4,991 AUD
Retailer 6$5,182 AUD
Retailer 4$5,183 AUD
Retailer 7$5,331 AUD
Retailer 9$5,553 AUD
Retailer 8$5,647 AUD
Retailer 14$5,760 AUD
Retailer 2$6,135 AUD
Retailer 13$8,393 AUD
NZ Jewellers$8,697 AUD

37 data points across 17 retailers

18 retailers$3,736 AUD to $8,697 AUD

A
Cheapest Retailer
-
$3,736 AUD
HK$20,500 HKD
A
Retailer 2
-
$3,842 AUD
₹257,058 INR
View
B+
Retailer 3
-
$4,168 AUD
View
B+
Retailer 4
-
$4,598 AUD
$3,230 USD
View
B+
Retailer 5
-
$4,598 AUD
$3,230 USD
View
B+
Retailer 6
-
$4,607 AUD
$3,236 USD
View
Final sale: no returns
B+
Retailer 7
-
$4,875 AUD
View
B+
Retailer 8
-
$4,991 AUD
$3,506 USD
View
B+
Retailer 9
-
$4,991 AUD
$3,506 USD
View
B+
Retailer 10
-
$5,182 AUD
SGD 4,919 SGD
View
B+
Retailer 11
-
$5,183 AUD
$3,641 USD
View
B+
Retailer 12
-
$5,331 AUD
$3,745 USD
View
Retailer 13
-
$5,553 AUD
View
Price last confirmed 24 days ago
Retailer 14
-
$5,647 AUD
€3,778 EUR
View
Price last confirmed 10 days ago
B+
Retailer 15
-
$5,760 AUD
$4,046 USD
View
B+
Retailer 16
-
$6,135 AUD
ZAR 69,625 ZAR
View
B+
Retailer 17
-
$8,393 AUD
£4,642 GBP
View
Most Expensive
B
NZ Jewellers
82aab777-aac8-4ee4-a9b1-3ad464c35c27 · Oct 27
$8,697 AUD
$6,109 USD
View
17 more retailers have this diamond
Prices start from $3,736 AUDSave up to $4,961 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
$3,736 AUD