CaratHunter
Plans
Heart|Natural|GIA

1.20ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 3535557448

Certificate GIA 3535557448

Diamond specifications and retailer prices

From £1,279 GBP
As of November 5, 2026
Save £254 GBP (17%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £1,533 GBP at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.2ct natural heart diamond

This 1.2ct natural heart 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 3535557448. Listed at 4 retailers as of November 5, 2026, with prices from £1,279 to £1,533, a £254 spread on the same certified stone. Blue Nile lists it at £1,533. 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

1.20
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 3535557448
Dimensions6.57 × 7.35 × 4.33 mm
L/W Ratio1.12
Top View
6.57 mm7.35 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 3535557448
Side View
Table 60.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 58.8%

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: £1,533 GBP|Low: £1,279 GBP|High: £1,907 GBP|Avg: £1,581 GBP|-19.6%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 5, 2026
Retailer 3£1,279 GBP
Retailer 2£1,382 GBP
Retailer 4£1,458 GBP
Blue Nile£1,533 GBP
Retailer 5£1,792 GBP

39 data points across 5 retailers

4 retailers£1,279 GBP to £1,533 GBP

A
Cheapest Retailer
-
£1,279 GBP
A
Retailer 2
-
£1,382 GBP
View
A
Retailer 3
-
£1,458 GBP
View
Most Expensive
B+
Blue Nile
26742561 · Nov 5
£1,533 GBP
$2,052 USD
View
3 more retailers have this diamond
Prices start from £1,279 GBPSave up to £254 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
1.20ct Heart
£1,279 GBP