Round|Natural|GIA

1.21ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 6495819176

Certificate GIA 6495819176

Diamond specifications and retailer prices

From £1,790 GBP
As of November 4, 2026
Save £2,265 GBP (56%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £4,055 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.21ct natural round diamond

This 1.21ct natural round sits in the classic one-carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6495819176. Listed at 15 retailers as of November 4, 2026, with prices from £1,790 to £4,055, a £2,265 spread on the same certified stone. NZ Jewellers lists it at £4,055. 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

1.21
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6495819176
Dimensions6.79 × 6.77 × 4.22 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
6.79 mm6.77 mm1.21 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6495819176
Side View
Table 57.0%Crown 36°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.3%

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: Nov 4
Current: £4,055 GBP|Low: £1,566 GBP|High: £4,055 GBP|Avg: £2,350 GBP|+4.8%
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
Retailer 15
Retailer 16
November 6, 2026
Retailer 6£1,688 GBP
Retailer 4£1,790 GBP
Retailer 2£1,830 GBP
Retailer 14£1,868 GBP
Retailer 13£1,939 GBP
Retailer 16£1,939 GBP
Retailer 3£2,029 GBP
Retailer 9£2,040 GBP
Retailer 7£2,155 GBP
Retailer 5£2,187 GBP
Retailer 15£2,238 GBP
Retailer 11£2,368 GBP
Retailer 10£2,403 GBP
Retailer 8£3,361 GBP
Retailer 12£3,399 GBP
NZ Jewellers£4,055 GBP

36 data points across 16 retailers

15 retailers£1,790 GBP to £4,055 GBP

B+
Cheapest Retailer
-
£1,790 GBP
Final sale: no returns
B+
Retailer 2
-
£1,830 GBP
View
B+
Retailer 3
-
£1,868 GBP
View
B+
Retailer 4
-
£1,939 GBP
View
Retailer 5
-
£1,939 GBP
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£2,029 GBP
View
B+
Retailer 7
-
£2,040 GBP
View
Retailer 8
-
£2,155 GBP
View
Price last confirmed 25 days ago
Retailer 9
-
£2,187 GBP
View
Price last confirmed 25 days ago
B+
Retailer 10
-
£2,238 GBP
View
B+
Retailer 11
-
£2,368 GBP
View
B
Retailer 12
-
£2,403 GBP
View
Retailer 13
-
£3,361 GBP
View
Price last confirmed 25 days ago
B
Retailer 14
-
£3,399 GBP
View
Most Expensive
B
NZ Jewellers
6f08d3b7-6352-41ba-bfd4-e59c6e82067d · Nov 5
£4,055 GBP
$5,428 USD
View
14 more retailers have this diamond
Prices start from £1,790 GBPSave up to £2,265 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+
1.21ct Round
£1,790 GBP