Round|Natural|GIA

0.30ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 6421167345

Certificate GIA 6421167345

Diamond specifications and retailer prices

From £298 GBP
$399 USD
As of October 28, 2026
Save £435 GBP (59%) vs most expensive(unlock to see where)
28 retailers carry this diamond
Most expensive: £733 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 0.3ct natural round diamond

This 0.3ct natural round sits in the sub-half-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6421167345. Listed at 28 retailers as of October 28, 2026, with prices from £298 to £733, a £435 spread on the same certified stone. MOH London lists it at £733. 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

0.30
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6421167345
Dimensions4.29 × 4.26 × 2.67 mm
L/W Ratio1.01
Top View
4.29 mm4.26 mm0.30 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6421167345
Side View
Table 59.0%Crown 35°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.4%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 28
Current: £733 GBP|Low: £298 GBP|High: £737 GBP|Avg: £470 GBP|+0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 9£298 GBP
Retailer 6£307 GBP
Retailer 10£346 GBP
Retailer 4£389 GBP
Retailer 7£423 GBP
Retailer 5£483 GBP
Retailer 2£489 GBP
Retailer 8£505 GBP
Retailer 3£640 GBP
MOH London£733 GBP

42 data points across 10 retailers

28 retailers£298 GBP to £733 GBP

Retailer 1
-
£286 GBP
$383 USD
Price last confirmed 23 days ago
Retailer 2
-
£286 GBP
$383 USD
View
Price last confirmed 43 days ago
Retailer 3
-
£286 GBP
$383 USD
View
Price last confirmed 9 days ago
B+
Retailer 4
-
£298 GBP
$399 USD
View
Retailer 5
-
£298 GBP
$400 USD
View
Price last confirmed 75 days ago
B
Retailer 6
-
£307 GBP
$412 USD
View
Retailer 7
-
£307 GBP
$412 USD
View
Price last confirmed 15 days ago
Retailer 8
-
£319 GBP
$427 USD
View
Price last confirmed 31 days ago
B
Retailer 9
-
£366 GBP
$490 USD
View
B
Retailer 10
-
£366 GBP
$490 USD
View
B
Retailer 11
-
£373 GBP
$500 USD
View
B
Retailer 12
-
£375 GBP
$502 USD
View
Retailer 13
-
£385 GBP
$516 USD
View
Price last confirmed 21 days ago
Retailer 14
-
£385 GBP
$516 USD
View
Price last confirmed 39 days ago
Retailer 15
-
£385 GBP
$516 USD
View
Price last confirmed 10 days ago
B
Retailer 16
-
£385 GBP
$516 USD
View
B
Retailer 17
-
£389 GBP
View
B
Retailer 18
-
£423 GBP
$567 USD
View
B
Retailer 19
-
£480 GBP
$643 USD
View
B
Retailer 20
-
£483 GBP
€616 EUR
View
B
Retailer 21
-
£489 GBP
ZAR 10,588 ZAR
View
Retailer 22
-
£505 GBP
A$1,042 AUD
View
Price last confirmed 27 days ago
B
Retailer 23
-
£640 GBP
View
Most Expensive
B
MOH London
1F2E23EE1 · Oct 29
£733 GBP
View
23 more retailers have this diamond
Prices start from £298 GBPSave up to £435 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.

B+
0.30ct Round
£298 GBP