CaratHunter
Plans
Heart|Natural|GIA

0.66ct I SI1 Heart Natural Diamond

EX • I/SI1 • GIA 6531469354

Certificate GIA 6531469354

Diamond specifications and retailer prices

From £344 GBP
MYR 1,881 MYR
As of November 2, 2026
Save £109 GBP (24%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £453 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

About this 0.66ct natural heart diamond

This 0.66ct natural heart sits in the half to three-quarter 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 6531469354. Listed at 5 retailers as of October 31, 2026, with prices from £344 to £453, a £109 spread on the same certified stone. Blue Nile lists it at £453. 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

0.66
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6531469354
Dimensions5.24 × 6.11 × 3.63 mm
L/W Ratio1.17
Top View
5.24 mm6.11 mm0.66 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6531469354
Side View
Table 59.0%CrownGirdle: MED-THKPavilionCulet: NoneDepth 59.4%

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 2
Current: £453 GBP|Low: £329 GBP|High: £537 GBP|Avg: £411 GBP|-15.6%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 2, 2026
Retailer 2£344 GBP
Retailer 5£351 GBP
Retailer 4£382 GBP
Retailer 3£441 GBP
Blue Nile£453 GBP

40 data points across 5 retailers

5 retailers£344 GBP to £453 GBP

A
Cheapest Retailer
-
£344 GBP
MYR 1,881 MYR
A
Retailer 2
-
£351 GBP
$471 USD
View
Final sale: no returns
A
Retailer 3
-
£382 GBP
SGD 692 SGD
View
A
Retailer 4
-
£441 GBP
View
Most Expensive
A
Blue Nile
26653350 · Oct 31
£453 GBP
$608 USD
View
4 more retailers have this diamond
Prices start from £344 GBPSave up to £109 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
0.66ct Heart
£344 GBP