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Heart|Natural|GIA

1.51ct D SI1 Heart Natural Diamond

EX • D/SI1 • GIA 1555854809

Certificate GIA 1555854809

Diamond specifications and retailer prices

From £3,771 GBP
As of November 6, 2026
Save £1,098 GBP (23%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £4,870 GBP at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.51ct natural heart diamond

This 1.51ct natural heart sits in the one-and-a-half to two carat band, graded D 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 1555854809. Listed at 6 retailers as of November 5, 2026, with prices from £3,771 to £4,870, a £1,098 spread on the same certified stone. Blue Nile lists it at £4,870. 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

1.51
Carat
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1555854809
Dimensions6.80 × 7.97 × 4.77 mm
L/W Ratio1.17
Culet sizeNone
Key to symbols
Crystal, Feather, Indented Natural, Natural
Top View
6.80 mm7.97 mm1.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 1555854809
Side View
Table 57.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 59.9%

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: £4,870 GBP|Low: £3,771 GBP|High: £5,144 GBP|Avg: £4,365 GBP|-5.3%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 2£3,771 GBP
Retailer 5£4,002 GBP
Retailer 4£4,145 GBP
Retailer 3£4,274 GBP
Blue Nile£4,870 GBP

46 data points across 5 retailers

6 retailers£3,771 GBP to £4,870 GBP

A
Cheapest Retailer
-
£3,771 GBP
A
Retailer 2
-
£4,002 GBP
View
A
Retailer 3
-
£4,145 GBP
View
A
Retailer 4
-
£4,274 GBP
View
B+
Retailer 5
-
£4,841 GBP
View
Most Expensive
B+
Blue Nile
29780360 · Nov 5
£4,870 GBP
$6,518 USD
View
5 more retailers have this diamond
Prices start from £3,771 GBPSave up to £1,098 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
1.51ct Heart
£3,771 GBP