CaratHunter
Plans
Heart|Natural|HRD

1.64ct K SI2 Heart Natural Diamond

ID • K/SI2 • HRD 190000105819

Certificate HRD 190000105819

Diamond specifications and retailer prices

From £3,571 GBP
As of November 4, 2026
Save £2,934 GBP (45%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £6,850 GBP at NZ Jewellers · As of September 30, 2026
View at NZ Jewellers

About this 1.64ct natural heart diamond

This 1.64ct natural heart sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by HRD 190000105819. Listed at 6 retailers as of November 4, 2026, with a 82% 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

1.64
Carat
K
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabHRD
CertificateHRD 190000105819
Dimensions6.74 × 8.11 × 4.96 mm
L/W Ratio1.20
Girdle conditionFaceted
Top View
6.74 mm8.11 mm1.64 ctK / SI2
OriginNatural
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateHRD 190000105819
Side View
Table 59.0%CrownGirdle: MediumPavilionCulet: NoneDepth 61.2%

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 4
Current: £6,505 GBP|Low: £2,678 GBP|High: £6,601 GBP|Avg: £4,183 GBP|-0.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 4, 2026
Retailer 7£2,678 GBP
Retailer 3£3,571 GBP
Retailer 6£3,889 GBP
Retailer 2£4,096 GBP
Retailer 4£4,210 GBP
Retailer 5£4,278 GBP
Retailer 1£6,505 GBP

10 data points across 7 retailers

6 retailers£3,571 GBP to £6,505 GBP

B+
Cheapest Retailer
-
£3,571 GBP
Retailer 2
-
£4,096 GBP
View
Price last confirmed 39 days ago
B
Retailer 3
-
£4,210 GBP
View
Retailer 4
-
£4,725 GBP
View
Price last confirmed 38 days ago
B
Retailer 5
-
£6,505 GBP
View
Most Expensive
NZ Jewellers
b130c17c-76ed-4683-a333-94a6ef108a07 · Sep 30
£6,850 GBP
$9,168 USD
View
Price last confirmed 37 days ago
5 more retailers have this diamond
Prices start from £3,571 GBPSave up to £2,934 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+
1.64ct Heart
£3,571 GBP