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Heart|Natural|GIA

1.26ct I SI1 Heart Natural Diamond

GD • I/SI1 • GIA 5453335159

Certificate GIA 5453335159

Diamond specifications and retailer prices

From £2,359 GBP
As of November 5, 2026
Save £932 GBP (28%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £3,291 GBP at 77 Diamonds · As of November 7, 2026
View at 77 Diamonds

About this 1.26ct natural heart diamond

This 1.26ct natural heart 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 standard cut grade stated by the retailer rather than the lab and certified by GIA 5453335159. Listed at 3 retailers as of November 5, 2026, with prices from £2,359 to £3,291, a £932 spread on the same certified stone. 77 Diamonds lists it at £3,291. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.26
Carat
I
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 5453335159
Dimensions6.23 × 6.03 × 4.09 mm
L/W Ratio1.03
Top View
6.23 mm6.03 mm1.26 ctI / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 5453335159
Side View
Table 61.0%CrownGirdle: ThinPavilionCulet: NoneDepth 67.7%

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: Nov 5
Current: £3,291 GBP|Low: £2,099 GBP|High: £3,327 GBP|Avg: £2,544 GBP|+0.1%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 7, 2026
Retailer 6£2,099 GBP
Retailer 5£2,229 GBP
Retailer 4£2,275 GBP
Retailer 7£2,352 GBP
Retailer 3£2,521 GBP
Retailer 8£2,733 GBP
Retailer 2£2,840 GBP
77 Diamonds£3,291 GBP

36 data points across 8 retailers

3 retailers£2,359 GBP to £3,291 GBP

B+
Cheapest Retailer
-
£2,359 GBP
B
Retailer 2
-
£2,472 GBP
View
Most Expensive
B
77 Diamonds
CUSZ4FSBHBXA · Nov 7
£3,291 GBP
View
2 more retailers have this diamond
Prices start from £2,359 GBPSave up to £932 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.

B+
1.26ct Heart
£2,359 GBP