Round|Natural|GIA

1.29ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 6552135118

Certificate GIA 6552135118

Diamond specifications and retailer prices

From £2,604 GBP
As of November 3, 2026
Save £2,114 GBP (45%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £4,915 GBP at NZ Jewellers · As of October 3, 2026
View at NZ Jewellers

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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6552135118. Listed at 14 retailers as of November 1, 2026, with a 81% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6552135118
Dimensions7.05 × 7.01 × 4.22 mm
L/W Ratio1.01
Star length45%
Top View
7.05 mm7.01 mm1.29 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6552135118
Side View
Table 59.0%Crown 33°GirdlePavilion 40.8°Culet: NoneDepth 60.0%

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 3
Current: £2,930 GBP|Low: £2,604 GBP|High: £4,908 GBP|Avg: £3,226 GBP|+1.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 3, 2026
Retailer 12£2,604 GBP
Retailer 13£2,701 GBP
Retailer 7£2,714 GBP
Retailer 3£2,821 GBP
Retailer 4£2,929 GBP
Retailer 1£2,930 GBP
Retailer 5£3,012 GBP
Retailer 2£3,024 GBP
Retailer 11£3,047 GBP
Retailer 10£3,249 GBP
Retailer 6£3,290 GBP
Retailer 9£3,467 GBP
Retailer 8£4,717 GBP

24 data points across 13 retailers

14 retailers£2,604 GBP to £4,717 GBP

A
Cheapest Retailer
-
£2,604 GBP
Final sale: no returns
A
Retailer 2
-
£2,701 GBP
View
A
Retailer 3
-
£2,714 GBP
View
Retailer 4
-
£2,821 GBP
View
Price last confirmed 29 days ago
Retailer 5
-
£2,929 GBP
View
Price last confirmed 28 days ago
B+
Retailer 6
-
£2,930 GBP
View
Retailer 7
-
£3,024 GBP
View
Price last confirmed 33 days ago
B+
Retailer 8
-
£3,047 GBP
View
B+
Retailer 9
-
£3,249 GBP
View
Retailer 10
-
£3,255 GBP
View
Price last confirmed 35 days ago
B+
Retailer 11
-
£3,290 GBP
View
B
Retailer 12
-
£3,467 GBP
View
B
Retailer 13
-
£4,717 GBP
View
Most Expensive
NZ Jewellers
0f788a29-1646-44e9-927e-51f021c4856d · Oct 3
£4,915 GBP
$6,579 USD
View
Price last confirmed 34 days ago
13 more retailers have this diamond
Prices start from £2,604 GBPSave up to £2,114 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
£2,604 GBP