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Heart|Natural|GIA

1.21ct H SI1 Heart Natural Diamond

GD • H/SI1 • GIA 6137692565

Certificate GIA 6137692565

Diamond specifications and retailer prices

From £1,564 GBP
As of November 6, 2026
Save £816 GBP (34%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £2,380 GBP at 77 Diamonds · As of November 6, 2026
View at 77 Diamonds

About this 1.21ct natural heart diamond

This 1.21ct natural heart sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 6137692565. Listed at 4 retailers as of November 6, 2026, with prices from £1,564 to £2,380, a £816 spread on the same certified stone. 77 Diamonds lists it at £2,380. 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

1.21
Carat
H
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishVery Good
SymmetryGood
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6137692565
Dimensions5.75 × 5.63 × 4.32 mm
L/W Ratio1.02
Top View
5.75 mm5.63 mm1.21 ctH / SI1
OriginNatural
CutGood
PolishVery Good
SymmetryGood
FluorescenceNone
CertificateGIA 6137692565
Side View
Table 56.0%CrownGirdle: VTK-EXTPavilionCulet: NoneDepth 76.7%

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: £2,380 GBP|Low: £1,564 GBP|High: £2,407 GBP|Avg: £1,994 GBP|+1.3%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
November 6, 2026
Retailer 2£1,564 GBP
Retailer 3£1,733 GBP
Retailer 4£2,285 GBP
77 Diamonds£2,380 GBP

36 data points across 4 retailers

4 retailers£1,564 GBP to £2,380 GBP

B+
Cheapest Retailer
-
£1,564 GBP
B+
Retailer 2
-
£1,620 GBP
View
B+
Retailer 3
-
£1,698 GBP
View
Most Expensive
B
77 Diamonds
CUSMBK2MYAZFQ · Nov 6
£2,380 GBP
View
3 more retailers have this diamond
Prices start from £1,564 GBPSave up to £816 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+
1.21ct Heart
£1,564 GBP