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Heart|Natural|GIA

0.66ct D SI1 Heart Natural Diamond

EX • D/SI1 • GIA 6505277936

Certificate GIA 6505277936

Diamond specifications and retailer prices

From £953 GBP
$1,279 USD
As of November 2, 2026
Save £272 GBP (22%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £1,225 GBP at 77 Diamonds · As of November 1, 2026
View at 77 Diamonds

About this 0.66ct natural heart diamond

This 0.66ct natural heart sits in the half to three-quarter 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 6505277936. Listed at 2 retailers as of November 1, 2026, with prices from £953 to £1,225, a £272 spread on the same certified stone. 77 Diamonds lists it at £1,225. 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
D
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6505277936
Dimensions5.27 × 5.91 × 3.51 mm
L/W Ratio1.12
Top View
5.27 mm5.91 mm0.66 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6505277936
Side View
Table 58.0%CrownGirdle: MED-VTKPavilionCuletDepth 59.4%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 2
Current: £1,225 GBP|Low: £953 GBP|High: £1,225 GBP|Avg: £1,095 GBP|+2.3%
77 Diamonds
Retailer 2
November 1, 2026
Retailer 2£953 GBP
77 Diamonds£1,225 GBP

30 data points across 2 retailers

2 retailers£953 GBP to £1,225 GBP

B+
Cheapest Retailer
-
£953 GBP
$1,279 USD
Most Expensive
B
77 Diamonds
HSCPGQ6EUGEA · Nov 1
£1,225 GBP
View
1 more retailer has this diamond
Prices start from £953 GBPSave up to £272 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+
0.66ct Heart
£953 GBP