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Round|Natural|GIA

0.40ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 2507684551

Certificate GIA 2507684551

Diamond specifications and retailer prices

From $1,079 AUD
$758 USD
As of October 29, 2026
Save $1,112 AUD (51%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $3,732 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 0.4ct natural round diamond

This 0.4ct natural round sits in the sub-half-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2507684551. Listed at 18 retailers as of October 29, 2026, with a 103% 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

0.40
Carat
D
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 2507684551
Dimensions4.75 × 4.72 × 2.90 mm
L/W Ratio1.01
Star length55%
Lower girdle80%
Top View
4.75 mm4.72 mm0.40 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2507684551
Side View
Table 61.0%Crown 34.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 61.2%

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 29
Current: $3,732 AUD|Low: $1,053 AUD|High: $3,732 AUD|Avg: $1,596 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 5$1,053 AUD
Retailer 10$1,059 AUD
Retailer 7$1,079 AUD
Retailer 9$1,079 AUD
Retailer 6$1,120 AUD
Retailer 8$1,244 AUD
Retailer 2$1,426 AUD
Retailer 3$1,551 AUD
Retailer 4$2,191 AUD
NZ Jewellers$3,732 AUD

42 data points across 10 retailers

18 retailers$1,079 AUD to $2,191 AUD

Retailer 1
-
$1,053 AUD
$740 USD
Price last confirmed 9 days ago
Retailer 2
-
$1,059 AUD
$744 USD
View
Price last confirmed 22 days ago
B+
Retailer 3
-
$1,079 AUD
$758 USD
View
B+
Retailer 4
-
$1,079 AUD
$758 USD
View
B+
Retailer 5
-
$1,087 AUD
$764 USD
View
B+
Retailer 6
-
$1,100 AUD
View
B+
Retailer 7
-
$1,120 AUD
$787 USD
View
B+
Retailer 8
-
$1,244 AUD
$874 USD
View
B
Retailer 9
-
$1,324 AUD
$930 USD
View
B
Retailer 10
-
$1,324 AUD
$930 USD
View
B
Retailer 11
-
$1,366 AUD
$960 USD
View
B
Retailer 12
-
$1,426 AUD
£789 GBP
View
B
Retailer 13
-
$1,520 AUD
$1,068 USD
View
B
Retailer 14
-
$1,551 AUD
€1,038 EUR
View
B
Retailer 15
-
$1,682 AUD
£930 GBP
View
B
Retailer 16
-
$1,915 AUD
CA$1,869 CAD
View
B
Retailer 17
-
$2,191 AUD
£1,212 GBP
View
Most Expensive
NZ Jewellers
3cc5280c-b09b-479f-ab98-90e441083a6f · Oct 30
$3,732 AUD
$2,622 USD
View
Price under review
17 more retailers have this diamond
Prices start from $1,079 AUDSave up to $1,112 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+
0.40ct Round
$1,079 AUD