Radiant|Natural|GIA

0.40ct I SI2 Radiant Natural Diamond

ID • I/SI2 • GIA 1553566105

Certificate GIA 1553566105

Diamond specifications and retailer prices

From £240 GBP
$321 USD
As of October 31, 2026
Save £421 GBP (64%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,097 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 0.4ct natural radiant diamond

This 0.4ct natural radiant sits in the sub-half-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1553566105. Listed at 14 retailers as of October 31, 2026, with a 176% 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
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle35.8°
Pavilion angle60.56°
OriginNatural
Grading LabGIA
CertificateGIA 1553566105
Dimensions5.07 × 3.74 × 2.53 mm
L/W Ratio1.36
Girdle conditionPolished
Top View
5.07 mm3.74 mm0.40 ctI / SI2
OriginNatural
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 1553566105
Side View
Table 65.0%Crown 35.8°Girdle: THN-MEDPavilion 60.56°Culet: NDepth 67.6%

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 31
Current: £1,097 GBP|Low: £240 GBP|High: £1,136 GBP|Avg: £460 GBP|-3.4%
NZ Jewellers
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
November 1, 2026
Retailer 3£240 GBP
Retailer 11£240 GBP
Retailer 13£259 GBP
Retailer 6£277 GBP
Retailer 5£279 GBP
Retailer 4£289 GBP
Retailer 9£340 GBP
Retailer 14£343 GBP
Retailer 12£349 GBP
Retailer 7£370 GBP
Retailer 10£465 GBP
Retailer 2£579 GBP
Retailer 8£661 GBP
NZ Jewellers£1,097 GBP

31 data points across 14 retailers

14 retailers£240 GBP to £661 GBP

A
Cheapest Retailer
-
£240 GBP
$321 USD
A
Retailer 2
-
£240 GBP
$321 USD
View
Final sale: no returns
A
Retailer 3
-
£259 GBP
$347 USD
View
A
Retailer 4
-
£277 GBP
HK$2,900 HKD
View
A
Retailer 5
-
£279 GBP
$374 USD
View
A
Retailer 6
-
£289 GBP
$387 USD
View
B+
Retailer 7
-
£340 GBP
$455 USD
View
B+
Retailer 8
-
£343 GBP
$459 USD
View
B+
Retailer 9
-
£349 GBP
$468 USD
View
B+
Retailer 10
-
£370 GBP
View
B+
Retailer 11
-
£465 GBP
€594 EUR
View
B
Retailer 12
-
£579 GBP
View
B
Retailer 13
-
£661 GBP
View
Most Expensive
NZ Jewellers
bb499261-4238-4c50-b80c-a9e86ae7201d · Oct 30
£1,097 GBP
$1,470 USD
View
Price under review
13 more retailers have this diamond
Prices start from £240 GBPSave up to £421 GBP

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 Radiant
£240 GBP