Round|Natural|GIA

1.51ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 1555390060

Certificate GIA 1555390060

Diamond specifications and retailer prices

From $6,775 AUD
$4,759 USD
As of October 30, 2026
Save $5,859 AUD (46%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: $15,114 AUD at NZ Jewellers · As of September 19, 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 D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1555390060. Listed at 17 retailers as of October 30, 2026, with a 86% 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
D
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1555390060
Dimensions7.27 × 7.31 × 4.57 mm
L/W Ratio1.01
Key to symbols
Twinning Wisp, Cloud, Crystal, Feather, Needle, Natural
Top View
7.27 mm7.31 mm1.51 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1555390060
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.7%

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 30
Current: $12,634 AUD|Low: $6,775 AUD|High: $13,473 AUD|Avg: $9,042 AUD|-5.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 8$6,775 AUD
Retailer 6$7,680 AUD
Retailer 2$8,187 AUD
Retailer 3$8,310 AUD
Retailer 7$8,684 AUD
Retailer 9$8,684 AUD
Retailer 5$8,969 AUD
Retailer 4$9,371 AUD
Retailer 10$9,458 AUD
Retailer 1$12,634 AUD

41 data points across 10 retailers

17 retailers$6,775 AUD to $12,634 AUD

A
Cheapest Retailer
-
$6,775 AUD
$4,759 USD
A
Retailer 2
-
$7,680 AUD
$5,395 USD
View
Retailer 3
-
$7,874 AUD
$5,531 USD
View
Price last confirmed 25 days ago
Retailer 4
-
$7,874 AUD
$5,531 USD
View
Price last confirmed 20 days ago
Retailer 5
-
$8,187 AUD
$5,751 USD
View
Price last confirmed 44 days ago
Retailer 6
-
$8,187 AUD
$5,751 USD
View
Price last confirmed 32 days ago
A
Retailer 7
-
$8,310 AUD
£4,596 GBP
View
A
Retailer 8
-
$8,684 AUD
$6,100 USD
View
A
Retailer 9
-
$8,684 AUD
$6,100 USD
View
A
Retailer 10
-
$8,969 AUD
$6,300 USD
View
Retailer 11
-
$9,084 AUD
$6,381 USD
View
Price last confirmed 22 days ago
A
Retailer 12
-
$9,371 AUD
€6,269 EUR
View
Retailer 13
-
$9,446 AUD
$6,635 USD
View
Price last confirmed 40 days ago
Retailer 14
-
$9,458 AUD
$6,644 USD
View
Price last confirmed 9 days ago
B+
Retailer 15
-
$12,634 AUD
£6,988 GBP
View
Retailer 16
-
$14,535 AUD
$10,210 USD
View
Price last confirmed 25 days ago
Most Expensive
NZ Jewellers
6ad84f01-e27b-4002-bd3a-7a6eb7c9473f · Sep 19
$15,114 AUD
$10,617 USD
View
Price last confirmed 42 days ago
16 more retailers have this diamond
Prices start from $6,775 AUDSave up to $5,859 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
$6,775 AUD