Round|Natural|GIA

0.30ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 6421167345

Certificate GIA 6421167345

Diamond specifications and retailer prices

From $399 USD
As of October 28, 2026
Save $583 USD (59%) vs most expensive(unlock to see where)
28 retailers carry this diamond
Most expensive: $982 USD 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 $399 to $982, a $583 spread on the same certified stone. MOH London lists it at $982. 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
Color
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

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 28
Current: $982 USD|Low: $399 USD|High: $988 USD|Avg: $630 USD|+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$399 USD
Retailer 6$412 USD
Retailer 10$464 USD
Retailer 4$521 USD
Retailer 7$567 USD
Retailer 5$647 USD
Retailer 2$655 USD
Retailer 8$677 USD
Retailer 3$858 USD
MOH London$982 USD

42 data points across 10 retailers

28 retailers$399 USD to $982 USD

Retailer 1
-
$383 USD
Price last confirmed 22 days ago
Retailer 2
-
$383 USD
View
Price last confirmed 43 days ago
Retailer 3
-
$383 USD
View
Price last confirmed 8 days ago
B+
Retailer 4
-
$399 USD
View
Retailer 5
-
$400 USD
View
Price last confirmed 75 days ago
B
Retailer 6
-
$412 USD
View
Retailer 7
-
$412 USD
View
Price last confirmed 14 days ago
Retailer 8
-
$427 USD
View
Price last confirmed 31 days ago
B
Retailer 9
-
$490 USD
View
B
Retailer 10
-
$490 USD
View
B
Retailer 11
-
$500 USD
View
B
Retailer 12
-
$502 USD
View
Retailer 13
-
$516 USD
View
Price last confirmed 21 days ago
Retailer 14
-
$516 USD
View
Price last confirmed 38 days ago
Retailer 15
-
$516 USD
View
Price last confirmed 10 days ago
B
Retailer 16
-
$516 USD
View
B
Retailer 17
-
$521 USD
£410 GBP
View
B
Retailer 18
-
$567 USD
View
B
Retailer 19
-
$643 USD
View
B
Retailer 20
-
$647 USD
€616 EUR
View
B
Retailer 21
-
$655 USD
ZAR 10,588 ZAR
View
Retailer 22
-
$677 USD
A$1,042 AUD
View
Price last confirmed 26 days ago
B
Retailer 23
-
$858 USD
£676 GBP
View
Most Expensive
B
MOH London
1F2E23EE1 · Oct 29
$982 USD
£773 GBP
View
23 more retailers have this diamond
Prices start from $399 USDSave up to $583 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.

B+
0.30ct Round
$399 USD