Round|Natural|GIA

0.40ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566413935

Certificate GIA 2566413935

Diamond specifications and retailer prices

From $320 USD
HK$2,500 HKD
As of October 27, 2026
Save $522 USD (62%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $1,457 USD at NZ Jewellers · As of October 3, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566413935. Listed at 22 retailers as of October 26, 2026, with a 163% 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
I
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 2566413935
Dimensions4.78 × 4.80 × 2.87 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Culet sizeNone
Key to symbols
Crystal
Top View
4.78 mm4.80 mm0.40 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566413935
Side View
Table 58.0%Crown 34°Girdle: THN-MEDPavilion 40.6°Culet: NoneDepth 59.8%

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: $617 USD|Low: $268 USD|High: $889 USD|Avg: $531 USD
Retailer 1
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
November 1, 2026
Retailer 15$268 USD
Retailer 8$320 USD
Retailer 4$345 USD
Retailer 16$392 USD
Retailer 6$392 USD
Retailer 2$406 USD
Retailer 5$411 USD
Retailer 17$495 USD
Retailer 7$526 USD
Retailer 13$564 USD
Retailer 14$580 USD
Retailer 9$609 USD
Retailer 1$617 USD
Retailer 11$652 USD
Retailer 10$664 USD
Retailer 12$738 USD
Retailer 3$842 USD

24 data points across 17 retailers

22 retailers$320 USD to $842 USD

Retailer 1
-
$268 USD
₹25,544 INR
Price last confirmed 7 days ago
A
Retailer 2
-
$320 USD
HK$2,500 HKD
View
A
Retailer 3
-
$345 USD
View
Retailer 4
-
$366 USD
View
Price last confirmed 23 days ago
Retailer 5
-
$380 USD
View
Price last confirmed 24 days ago
A
Retailer 6
-
$392 USD
SGD 530 SGD
View
Retailer 7
-
$406 USD
View
Price last confirmed 7 days ago
A
Retailer 8
-
$411 USD
View
Retailer 9
-
$493 USD
View
Price last confirmed 23 days ago
A
Retailer 10
-
$495 USD
View
Retailer 11
-
$512 USD
View
Price last confirmed 28 days ago
B+
Retailer 12
-
$526 USD
View
B+
Retailer 13
-
$564 USD
ZAR 9,108 ZAR
View
Retailer 14
-
$580 USD
View
Price last confirmed 5 days ago
Retailer 15
-
$609 USD
A$937 AUD
View
Price last confirmed 28 days ago
B+
Retailer 16
-
$617 USD
€588 EUR
View
B
Retailer 17
-
$652 USD
View
B
Retailer 18
-
$664 USD
£523 GBP
View
B+
Retailer 19
-
$738 USD
£581 GBP
View
B
Retailer 20
-
$842 USD
£663 GBP
View
Retailer 21
-
$1,404 USD
View
Price last confirmed 23 days ago
Most Expensive
NZ Jewellers
36189494-d04e-449a-a008-13f200b78775 · Oct 3
$1,457 USD
View
Price last confirmed 29 days ago
21 more retailers have this diamond
Prices start from $320 USDSave up to $522 USD

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
0.40ct Round
$320 USD