Oval|Natural|GIA

1.21ct I SI1 Oval Natural Diamond

EX • I/SI1 • GIA 2568507379

Certificate GIA 2568507379

Diamond specifications and retailer prices

From £1,918 GBP
As of November 5, 2026
Save £1,644 GBP (46%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £3,561 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.21ct natural oval diamond

This 1.21ct natural oval sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2568507379. Listed at 15 retailers as of November 5, 2026, with prices from £1,918 to £3,561, a £1,644 spread on the same certified stone. Helzberg Diamonds lists it at £3,561. 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle35.9°
Pavilion angle38.65°
OriginNatural
Grading LabGIA
CertificateGIA 2568507379
Dimensions8.46 × 6.04 × 3.65 mm
L/W Ratio1.40
Culet sizeNone
Top View
8.46 mm6.04 mm1.21 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2568507379
Side View
Table 58.0%Crown 35.9°Girdle: STK-THKPavilion 38.65°Culet: NDepth 60.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £3,561 GBP|Low: £1,894 GBP|High: £3,561 GBP|Avg: £2,496 GBP
Helzberg Diamonds
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 11£1,918 GBP
Retailer 15£2,037 GBP
Retailer 12£2,044 GBP
Retailer 5£2,055 GBP
Retailer 14£2,058 GBP
Retailer 7£2,071 GBP
Retailer 10£2,213 GBP
Retailer 6£2,255 GBP
Retailer 16£2,420 GBP
Retailer 9£2,495 GBP
Retailer 8£2,496 GBP
Retailer 2£2,598 GBP
Retailer 13£2,617 GBP
Retailer 4£3,157 GBP
Retailer 3£3,372 GBP
Helzberg Diamonds£3,561 GBP

25 data points across 16 retailers

15 retailers£1,918 GBP to £3,561 GBP

A
Cheapest Retailer
-
£1,918 GBP
B+
Retailer 2
-
£2,037 GBP
View
B+
Retailer 3
-
£2,044 GBP
View
B+
Retailer 4
-
£2,055 GBP
View
B+
Retailer 5
-
£2,058 GBP
View
B+
Retailer 6
-
£2,071 GBP
View
B+
Retailer 7
-
£2,213 GBP
View
B+
Retailer 8
-
£2,255 GBP
View
B+
Retailer 9
-
£2,420 GBP
View
B+
Retailer 10
-
£2,495 GBP
View
B
Retailer 11
-
£2,496 GBP
View
B+
Retailer 12
-
£2,598 GBP
View
B
Retailer 13
-
£3,157 GBP
View
B
Retailer 14
-
£3,372 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRILMOLGNJNP · Nov 6
£3,561 GBP
$4,767 USD
View
14 more retailers have this diamond
Prices start from £1,918 GBPSave up to £1,644 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
1.21ct Oval
£1,918 GBP