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Round|Natural|GIA

1.29ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 387

Certificate GIA 387

Diamond specifications and retailer prices

From £1,729 GBP
As of November 4, 2026
Save £310 GBP (15%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £2,039 GBP at Blue Nile · As of November 5, 2026
View at Blue Nile

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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 3 retailers as of November 4, 2026, with prices from £1,729 to £2,039, a £310 spread on the same certified stone. Blue Nile lists it at £2,039. 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishGood
SymmetryGood
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 387
Dimensions6.90 × 6.94 × 4.36 mm
L/W Ratio1.01
Top View
6.90 mm6.94 mm1.29 ctK / SI1
OriginNatural
CutExcellent
PolishGood
SymmetryGood
FluorescenceFaint
CertificateGIA 387
Side View
Table 56.0%CrownGirdle: Thin - Sli. ThickPavilionCulet: NoneDepth 62.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 4
Current: £2,039 GBP|Low: £1,729 GBP|High: £2,158 GBP|Avg: £1,889 GBP|-5.5%
Blue Nile
Retailer 2
Retailer 3
October 28, 2026
Retailer 3£1,729 GBP
Retailer 2£1,730 GBP
Blue Nile£2,039 GBP

12 data points across 3 retailers

3 retailers£1,729 GBP to £2,039 GBP

A
Cheapest Retailer
-
£1,729 GBP
A
Retailer 2
-
£1,730 GBP
View
Most Expensive
B+
Blue Nile
30169346 · Nov 5
£2,039 GBP
$2,729 USD
View
2 more retailers have this diamond
Prices start from £1,729 GBPSave up to £310 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
£1,729 GBP