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Round|Natural|GIA

1.51ct I SI1 Round Natural Diamond

VG • I/SI1 • GIA 1549280379

Certificate GIA 1549280379

Diamond specifications and retailer prices

From $5,376 AUD
$3,781 USD
As of October 27, 2026
Save $6,913 AUD (56%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $12,289 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 very-good cut grade and certified by GIA 1549280379. Listed at 24 retailers as of October 27, 2026, with prices from $5,376 to $12,289, a $6,913 spread on the same certified stone. NZ Jewellers lists it at $12,289. 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
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle38.5°
Pavilion angle39.8°
OriginNatural
Grading LabGIA
CertificateGIA 1549280379
Dimensions7.16 × 7.10 × 4.60 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
7.16 mm7.10 mm1.51 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1549280379
Side View
Table 55.0%Crown 38.5°Girdle: STK-THKPavilion 39.8°Culet: NoneDepth 64.4%

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: $12,289 AUD|Low: $5,308 AUD|High: $12,289 AUD|Avg: $7,350 AUD
NZ Jewellers
Retailer 2
Retailer 3
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Retailer 5
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Retailer 8
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Retailer 11
Retailer 12
Retailer 13
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Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
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Retailer 21
Retailer 22
Retailer 23
Retailer 24
October 29, 2026
Retailer 4$5,376 AUD
Retailer 9$5,460 AUD
Retailer 5$5,621 AUD
Retailer 19$5,807 AUD
Retailer 7$5,848 AUD
Retailer 12$6,145 AUD
Retailer 11$6,285 AUD
Retailer 22$6,299 AUD
Retailer 8$6,657 AUD
Retailer 14$6,657 AUD
Retailer 16$6,657 AUD
Retailer 3$7,138 AUD
Retailer 23$7,138 AUD
Retailer 21$7,244 AUD
Retailer 20$7,365 AUD
Retailer 17$7,453 AUD
Retailer 2$7,602 AUD
Retailer 15$7,681 AUD
Retailer 18$7,840 AUD
Retailer 6$8,111 AUD
Retailer 10$8,550 AUD
Retailer 24$8,948 AUD
Retailer 13$11,767 AUD
NZ Jewellers$12,289 AUD

27 data points across 24 retailers

24 retailers$5,376 AUD to $12,289 AUD

A
Cheapest Retailer
-
$5,376 AUD
$3,781 USD
A
Retailer 2
-
$5,460 AUD
HK$30,000 HKD
View
A
Retailer 3
-
$5,621 AUD
$3,953 USD
View
A
Retailer 4
-
$5,807 AUD
$4,084 USD
View
A
Retailer 5
-
$5,848 AUD
$4,113 USD
View
B+
Retailer 6
-
$6,145 AUD
$4,322 USD
View
Final sale: no returns
A
Retailer 7
-
$6,285 AUD
$4,420 USD
View
A
Retailer 8
-
$6,299 AUD
$4,430 USD
View
B+
Retailer 9
-
$6,657 AUD
$4,682 USD
View
A
Retailer 10
-
$6,657 AUD
$4,682 USD
View
A
Retailer 11
-
$6,657 AUD
$4,682 USD
View
B+
Retailer 12
-
$7,138 AUD
$5,020 USD
View
A
Retailer 13
-
$7,138 AUD
$5,020 USD
View
A
Retailer 14
-
$7,244 AUD
£4,012 GBP
View
A
Retailer 15
-
$7,365 AUD
$5,180 USD
View
B+
Retailer 16
-
$7,453 AUD
View
Price last confirmed 19 days ago
B+
Retailer 17
-
$7,602 AUD
£4,210 GBP
View
B+
Retailer 18
-
$7,681 AUD
$5,402 USD
View
B+
Retailer 19
-
$7,840 AUD
€5,251 EUR
View
B+
Retailer 20
-
$8,111 AUD
$5,704 USD
View
B+
Retailer 21
-
$8,550 AUD
$6,013 USD
View
B+
Retailer 22
-
$8,948 AUD
ZAR 101,664 ZAR
View
B
Retailer 23
-
$11,767 AUD
£6,516 GBP
View
Most Expensive
B
NZ Jewellers
3e2f5f46-1ce4-4305-949f-1309faa1ab4c · Oct 27
$12,289 AUD
$8,643 USD
View
23 more retailers have this diamond
Prices start from $5,376 AUDSave up to $6,913 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
$5,376 AUD