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Round|Natural|GIA

1.29ct J SI1 Round Natural Diamond

EX • J/SI1 • GIA 5241083858

Certificate GIA 5241083858

Diamond specifications and retailer prices

From £1,661 GBP
As of November 5, 2026
Save £1,393 GBP (46%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £3,054 GBP at Helzberg Diamonds · As of November 6, 2026
View at Helzberg Diamonds

About this 1.29ct natural round diamond

This 1.29ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 5241083858. Listed at 16 retailers as of November 5, 2026, with prices from £1,661 to £3,054, a £1,393 spread on the same certified stone. Helzberg Diamonds lists it at £3,054. 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

1.29
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
Crown angle34.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 5241083858
Dimensions6.94 × 6.97 × 4.33 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.94 mm6.97 mm1.29 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceStrong
CertificateGIA 5241083858
Side View
Table 58.0%Crown 34.5°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 62.2%

Caratlytics Score

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

Price History

Last verified: Nov 5
Current: £3,054 GBP|Low: £1,652 GBP|High: £3,086 GBP|Avg: £2,164 GBP|-1.0%
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 12£1,661 GBP
Retailer 4£1,727 GBP
Retailer 9£1,734 GBP
Retailer 2£1,746 GBP
Retailer 16£1,763 GBP
Retailer 15£1,776 GBP
Retailer 13£1,888 GBP
Retailer 8£1,934 GBP
Retailer 6£2,092 GBP
Retailer 7£2,188 GBP
Retailer 14£2,201 GBP
Retailer 10£2,227 GBP
Retailer 11£2,267 GBP
Retailer 3£2,708 GBP
Retailer 5£2,894 GBP
Helzberg Diamonds£3,054 GBP

37 data points across 16 retailers

16 retailers£1,661 GBP to £3,054 GBP

A
Cheapest Retailer
-
£1,661 GBP
A
Retailer 2
-
£1,727 GBP
View
A
Retailer 3
-
£1,734 GBP
View
A
Retailer 4
-
£1,746 GBP
View
A
Retailer 5
-
£1,763 GBP
View
A
Retailer 6
-
£1,776 GBP
View
A
Retailer 7
-
£1,888 GBP
View
B+
Retailer 8
-
£1,934 GBP
View
B+
Retailer 9
-
£2,092 GBP
View
B+
Retailer 10
-
£2,188 GBP
View
B+
Retailer 11
-
£2,201 GBP
View
B+
Retailer 12
-
£2,227 GBP
View
B+
Retailer 13
-
£2,267 GBP
View
B
Retailer 14
-
£2,708 GBP
View
B
Retailer 15
-
£2,894 GBP
View
Most Expensive
B
Helzberg Diamonds
XZRLIKHGOJOLO · Nov 6
£3,054 GBP
$4,088 USD
View
15 more retailers have this diamond
Prices start from £1,661 GBPSave up to £1,393 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
1.29ct Round
£1,661 GBP