Oval|Natural|GIA

1.20ct J SI1 Oval Natural Diamond

ID • J/SI1 • GIA 1559636147

Certificate GIA 1559636147

Diamond specifications and retailer prices

From $4,207 AUD
$2,955 USD
As of October 30, 2026
Save $4,540 AUD (52%) vs most expensive(unlock to see where)
29 retailers carry this diamond
Most expensive: $9,111 AUD at NZ Jewellers · As of September 29, 2026
View at NZ Jewellers

About this 1.2ct natural oval diamond

This 1.2ct natural oval sits in the classic one-carat band, graded J 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 1559636147. Listed at 29 retailers as of October 30, 2026, with a 108% 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

1.20
Carat
J
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1559636147
Dimensions8.59 × 5.92 × 3.54 mm
L/W Ratio1.45
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Cloud, Twinning Wisp, Cavity, Needle
Top View
8.59 mm5.92 mm1.20 ctJ / SI1
OriginNatural
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 1559636147
Side View
Table 58.0%CrownGirdle: THN-VTKPavilionCulet: NoneDepth 59.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $5,101 AUD|Low: $4,738 AUD|High: $8,852 AUD|Avg: $5,996 AUD|-1.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 8$4,738 AUD
Retailer 9$4,817 AUD
Retailer 10$4,963 AUD
Retailer 1$5,101 AUD
Retailer 5$5,466 AUD
Retailer 11$5,514 AUD
Retailer 3$5,607 AUD
Retailer 7$6,123 AUD
Retailer 6$6,428 AUD
Retailer 2$7,629 AUD
Retailer 4$8,747 AUD

37 data points across 11 retailers

29 retailers$4,207 AUD to $8,747 AUD

B+
Cheapest Retailer
-
$4,207 AUD
$2,955 USD
B
Retailer 2
-
$4,450 AUD
$3,126 USD
View
B
Retailer 3
-
$4,577 AUD
$3,215 USD
View
Retailer 4
-
$4,738 AUD
$3,328 USD
View
Price last confirmed 68 days ago
Retailer 5
-
$4,738 AUD
$3,328 USD
View
Price last confirmed 41 days ago
Retailer 6
-
$4,738 AUD
$3,328 USD
View
Price last confirmed 30 days ago
B
Retailer 7
-
$4,738 AUD
$3,328 USD
View
B
Retailer 8
-
$4,757 AUD
$3,342 USD
View
B
Retailer 9
-
$4,817 AUD
CA$4,700 CAD
View
Retailer 10
-
$4,920 AUD
$3,456 USD
View
Price last confirmed 32 days ago
B
Retailer 11
-
$4,963 AUD
$3,486 USD
View
B
Retailer 12
-
$5,101 AUD
£2,822 GBP
View
B
Retailer 13
-
$5,367 AUD
$3,770 USD
View
B
Retailer 14
-
$5,367 AUD
$3,770 USD
View
B
Retailer 15
-
$5,466 AUD
£3,023 GBP
View
Retailer 16
-
$5,467 AUD
$3,840 USD
View
Price last confirmed 54 days ago
Retailer 17
-
$5,467 AUD
$3,840 USD
View
Price last confirmed 41 days ago
Retailer 18
-
$5,467 AUD
$3,840 USD
View
Price last confirmed 33 days ago
B
Retailer 19
-
$5,514 AUD
$3,873 USD
View
B
Retailer 20
-
$5,552 AUD
$3,900 USD
View
Retailer 21
-
$5,607 AUD
View
Price last confirmed 28 days ago
B
Retailer 22
-
$5,677 AUD
$3,988 USD
View
B
Retailer 23
-
$6,123 AUD
€4,096 EUR
View
B
Retailer 24
-
$6,428 AUD
ZAR 72,949 ZAR
View
B
Retailer 25
-
$7,629 AUD
$5,359 USD
View
B
Retailer 26
-
$8,747 AUD
£4,838 GBP
View
Retailer 27
-
$9,111 AUD
$6,400 USD
View
Price last confirmed 51 days ago
Retailer 28
-
$9,111 AUD
$6,400 USD
View
Price last confirmed 41 days ago
Most Expensive
NZ Jewellers
edaa7ba8-bce8-4bff-81fa-16e451f7ab09 · Sep 29
$9,111 AUD
$6,400 USD
View
Price last confirmed 33 days ago
28 more retailers have this diamond
Prices start from $4,207 AUDSave up to $4,540 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.

B+
1.20ct Oval
$4,207 AUD