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Heart|Natural|GIA

1.38ct F SI1 Heart Natural Diamond

ID • F/SI1 • GIA 6551660709

Certificate GIA 6551660709

Diamond specifications and retailer prices

From £2,736 GBP
As of November 6, 2026
Save £2,527 GBP (48%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £5,668 GBP at NZ Jewellers · As of September 30, 2026
View at NZ Jewellers

About this 1.38ct natural heart diamond

This 1.38ct natural heart sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551660709. Listed at 17 retailers as of November 4, 2026, with a 92% 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

1.38
Carat
F
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.24°
Pavilion angle43.85°
OriginNatural
Grading LabGIA
CertificateGIA 6551660709
Dimensions6.70 × 7.75 × 4.66 mm
L/W Ratio1.16
Culet sizeNone
Key to symbols
Crystal, Feather, Cloud, Needle
Top View
6.70 mm7.75 mm1.38 ctF / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551660709
Side View
Table 58.0%Crown 36.24°Girdle: Slightly ThickPavilion 43.85°Culet: NoneDepth 60.1%

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 6
Current: £2,870 GBP|Low: £2,353 GBP|High: £5,278 GBP|Avg: £3,592 GBP|+4.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 5£2,736 GBP
Retailer 1£2,870 GBP
Retailer 2£2,950 GBP
Retailer 12£3,000 GBP
Retailer 9£3,149 GBP
Retailer 8£3,219 GBP
Retailer 4£3,253 GBP
Retailer 6£3,285 GBP
Retailer 3£3,470 GBP
Retailer 7£3,499 GBP
Retailer 10£3,852 GBP
Retailer 11£5,263 GBP

43 data points across 12 retailers

17 retailers£2,736 GBP to £5,263 GBP

A
Cheapest Retailer
-
£2,736 GBP
A
Retailer 2
-
£2,870 GBP
View
Final sale: no returns
B+
Retailer 3
-
£2,950 GBP
View
B+
Retailer 4
-
£3,000 GBP
View
B+
Retailer 5
-
£3,149 GBP
View
B+
Retailer 6
-
£3,219 GBP
View
Retailer 7
-
£3,253 GBP
View
Price last confirmed 37 days ago
Retailer 8
-
£3,253 GBP
View
Price last confirmed 37 days ago
Retailer 9
-
£3,253 GBP
View
Price last confirmed 22 days ago
B+
Retailer 10
-
£3,285 GBP
View
Retailer 11
-
£3,470 GBP
View
Price last confirmed 29 days ago
B+
Retailer 12
-
£3,499 GBP
View
Retailer 13
-
£3,753 GBP
View
Price last confirmed 39 days ago
Retailer 14
-
£3,753 GBP
View
Price last confirmed 53 days ago
B+
Retailer 15
-
£3,852 GBP
View
B
Retailer 16
-
£5,263 GBP
View
Most Expensive
NZ Jewellers
1612a176-36bd-4fa1-ac4f-12ac06dd862f · Sep 30
£5,668 GBP
$7,586 USD
View
Price last confirmed 37 days ago
16 more retailers have this diamond
Prices start from £2,736 GBPSave up to £2,527 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
1.38ct Heart
£2,736 GBP