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Heart|Natural|GIA

0.91ct H SI1 Heart Natural Diamond

EX • H/SI1 • GIA 6542515348

Certificate GIA 6542515348

Diamond specifications and retailer prices

From £553 GBP
HK$5,800 HKD
As of November 1, 2026
Save £817 GBP (60%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £2,183 GBP at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 0.91ct natural heart diamond

This 0.91ct natural heart sits in the just-under-one-carat band, graded H 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 6542515348. Listed at 14 retailers as of November 1, 2026, with a 148% 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

0.91
Carat
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6542515348
Dimensions5.75 × 6.76 × 4.02 mm
L/W Ratio1.18
Top View
5.75 mm6.76 mm0.91 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6542515348
Side View
Table 56.0%CrownGirdle: MED-THKPavilion 41.6°Culet: NoneDepth 59.5%

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 1
Current: £773 GBP|Low: £553 GBP|High: £1,552 GBP|Avg: £933 GBP|-21.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 2, 2026
Retailer 6£553 GBP
Retailer 10£690 GBP
Retailer 8£730 GBP
Retailer 9£760 GBP
Retailer 13£771 GBP
Retailer 1£773 GBP
Retailer 3£797 GBP
Retailer 12£883 GBP
Retailer 4£1,000 GBP
Retailer 5£1,079 GBP
Retailer 11£1,137 GBP
Retailer 2£1,208 GBP
Retailer 7£1,370 GBP

29 data points across 13 retailers

14 retailers£553 GBP to £1,370 GBP

A
Cheapest Retailer
-
£553 GBP
HK$5,800 HKD
A
Retailer 2
-
£690 GBP
$926 USD
View
Final sale: no returns
A
Retailer 3
-
£730 GBP
€933 EUR
View
A
Retailer 4
-
£760 GBP
$1,020 USD
View
A
Retailer 5
-
£771 GBP
$1,034 USD
View
A
Retailer 6
-
£773 GBP
View
Retailer 7
-
£797 GBP
SGD 1,446 SGD
View
Price last confirmed 10 days ago
A
Retailer 8
-
£883 GBP
$1,185 USD
View
B+
Retailer 9
-
£1,000 GBP
SGD 1,813 SGD
View
Retailer 10
-
£1,079 GBP
A$2,228 AUD
View
Price last confirmed 28 days ago
B+
Retailer 11
-
£1,137 GBP
ZAR 24,649 ZAR
View
Retailer 12
-
£1,208 GBP
$1,622 USD
View
Price last confirmed 10 days ago
B+
Retailer 13
-
£1,370 GBP
View
Most Expensive
NZ Jewellers
ec790a67-022d-42e3-b421-5e889851c541 · Sep 25
£2,183 GBP
$2,930 USD
View
Price last confirmed 38 days ago
13 more retailers have this diamond
Prices start from £553 GBPSave up to £817 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
0.91ct Heart
£553 GBP