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Heart|Natural|GIA

1.23ct F SI1 Heart Natural Diamond

GD • F/SI1 • GIA 2278523940

Certificate GIA 2278523940

Diamond specifications and retailer prices

From £1,764 GBP
As of November 6, 2026
Save £1,978 GBP (53%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £3,742 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.23ct natural heart diamond

This 1.23ct natural heart sits in the classic one-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 2278523940. Listed at 21 retailers as of November 4, 2026, with prices from £1,764 to £3,742, a £1,978 spread on the same certified stone. MOH London lists it at £3,742. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.23
Carat
F
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2278523940
Dimensions6.44 × 6.04 × 4.10 mm
L/W Ratio1.07
Top View
6.44 mm6.04 mm1.23 ctF / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2278523940
Side View
Table 62.0%CrownGirdle: STK-ETKPavilionCulet: NoneDepth 67.8%

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 6
Current: £3,742 GBP|Low: £1,470 GBP|High: £4,268 GBP|Avg: £2,359 GBP|-12.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
November 6, 2026
Retailer 17£1,764 GBP
Retailer 7£1,821 GBP
Retailer 3£1,827 GBP
Retailer 19£1,875 GBP
Retailer 20£1,919 GBP
Retailer 12£1,993 GBP
Retailer 18£1,999 GBP
Retailer 6£2,033 GBP
Retailer 10£2,059 GBP
Retailer 11£2,075 GBP
Retailer 16£2,205 GBP
Retailer 5£2,262 GBP
Retailer 14£2,375 GBP
Retailer 8£2,397 GBP
Retailer 13£2,460 GBP
Retailer 4£2,536 GBP
Retailer 15£2,738 GBP
Retailer 2£2,777 GBP
Retailer 9£3,234 GBP
MOH London£3,742 GBP

40 data points across 20 retailers

21 retailers£1,764 GBP to £3,742 GBP

B+
Cheapest Retailer
-
£1,764 GBP
B+
Retailer 2
-
£1,821 GBP
View
B+
Retailer 3
-
£1,827 GBP
View
B+
Retailer 4
-
£1,875 GBP
View
Final sale: no returns
B+
Retailer 5
-
£1,919 GBP
View
B+
Retailer 6
-
£1,993 GBP
View
B+
Retailer 7
-
£1,999 GBP
View
Retailer 8
-
£2,033 GBP
View
Price last confirmed 22 days ago
B+
Retailer 9
-
£2,059 GBP
View
Retailer 10
-
£2,075 GBP
View
Price last confirmed 23 days ago
B
Retailer 11
-
£2,205 GBP
View
B
Retailer 12
-
£2,262 GBP
View
B
Retailer 13
-
£2,375 GBP
View
B
Retailer 14
-
£2,393 GBP
View
Retailer 15
-
£2,397 GBP
View
Price last confirmed 31 days ago
B+
Retailer 16
-
£2,460 GBP
View
B
Retailer 17
-
£2,536 GBP
View
B
Retailer 18
-
£2,738 GBP
View
B
Retailer 19
-
£2,777 GBP
View
B
Retailer 20
-
£3,234 GBP
View
Most Expensive
B
MOH London
45AC09C87 · Nov 4
£3,742 GBP
View
20 more retailers have this diamond
Prices start from £1,764 GBPSave up to £1,978 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+
1.23ct Heart
£1,764 GBP