Round|Natural|GIA

1.21ct J SI2 Round Natural Diamond

EX • J/SI2 • GIA 1559331104

Certificate GIA 1559331104

Diamond specifications and retailer prices

From £1,722 GBP

$2,307 USD

As of October 31, 2026

Save £1,073 GBP (38%) vs most expensive(unlock to see where)

12 retailers carry this diamond

Most expensive: £2,794 GBP at Yorxs · As of November 1, 2026

View at Yorxs

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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1559331104. Listed at 12 retailers as of October 31, 2026, with prices from £1,722 to £2,794, a £1,073 spread on the same certified stone. Yorxs lists it at £2,794. 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

Colour

SI2

Clarity

Excellent

Cut

Specifications

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle36.5°

Pavilion angle41°

OriginNatural

Grading LabGIA

CertificateGIA 1559331104

Dimensions6.77 × 6.80 × 4.26 mm

L/W Ratio1.00

Culet sizeNone

View GIA Report →View Loupe360 Video →

Top View

OriginNatural

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateGIA 1559331104

Side View

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 31

Current: £1,725 GBP|Low: £1,310 GBP|High: £2,794 GBP|Avg: £1,700 GBP|-5.2%

Retailer 1

Retailer 2

Retailer 3

Retailer 4

Retailer 5

Retailer 6

Retailer 7

Retailer 8

Retailer 9

Retailer 10

Retailer 11

Retailer 12

Yorxs

November 1, 2026

Retailer 12£1,310 GBP

Retailer 3£1,332 GBP

Retailer 11£1,344 GBP

Retailer 9£1,416 GBP

Retailer 10£1,426 GBP

Retailer 8£1,434 GBP

Retailer 5£1,576 GBP

Retailer 7£1,709 GBP

Retailer 4£1,720 GBP

Retailer 1£1,725 GBP

Retailer 2£2,197 GBP

Retailer 6£2,360 GBP

Yorxs£2,794 GBP

34 data points across 13 retailers

12 retailers£1,722 GBP to £2,794 GBP

Retailer 1

£1,310 GBP

SGD 2,372 SGD

Price last confirmed 10 days ago

Retailer 2

£1,332 GBP

$1,785 USD

View

Price last confirmed 12 days ago

Retailer 3

£1,344 GBP

$1,801 USD

View

Price last confirmed 15 days ago

Retailer 4

£1,416 GBP

View

Price last confirmed 12 days ago

Retailer 5

£1,426 GBP

$1,911 USD

View

Price last confirmed 13 days ago

Retailer 6

£1,434 GBP

SGD 2,597 SGD

View

Price last confirmed 12 days ago

Retailer 7

£1,576 GBP

$2,112 USD

View

Price last confirmed 12 days ago

B+

Retailer 8

£1,722 GBP

$2,307 USD

View

Retailer 9

£1,725 GBP

View

Price last confirmed 12 days ago

Retailer 10

£2,197 GBP

$2,944 USD

View

Price last confirmed 13 days ago

Retailer 11

£2,360 GBP

$3,162 USD

View

Price last confirmed 12 days ago

Most Expensive

Yorxs

E25410B · Nov 1

£2,794 GBP

€3,566 EUR

View

11 more retailers have this diamond

Prices start from £1,722 GBPSave up to £1,073 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.

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B+

1.21ct Round

£1,722 GBP