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Round|Natural|GIA

1.28ct F SI1 Round Natural Diamond

VG • F/SI1 • GIA 6157771128

Certificate GIA 6157771128

Diamond specifications and retailer prices

From £3,214 GBP
$4,313 USD
As of November 2, 2026
Save £1,320 GBP (29%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £4,534 GBP at Yorxs · As of November 2, 2026
View at Yorxs

About this 1.28ct natural round diamond

This 1.28ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by GIA 6157771128. Listed at 6 retailers as of November 2, 2026, with prices from £3,214 to £4,534, a £1,320 spread on the same certified stone. Yorxs lists it at £4,534. 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

1.28
Carat
F
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6157771128
Dimensions6.94 × 7.00 × 4.29 mm
L/W Ratio1.01
Top View
6.94 mm7.00 mm1.28 ctF / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6157771128
Side View
Table 61.0%CrownGirdle: MediumPavilionCulet: NoneDepth 61.5%

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 2
Current: £4,512 GBP|Low: £3,172 GBP|High: £4,577 GBP|Avg: £4,064 GBP|-0.2%
Retailer 1
Retailer 2
Yorxs
November 2, 2026
Retailer 2£3,214 GBP
Retailer 1£4,512 GBP
Yorxs£4,534 GBP

35 data points across 3 retailers

6 retailers£3,214 GBP to £4,534 GBP

B+
Cheapest Retailer
-
£3,214 GBP
$4,313 USD
B+
Retailer 2
-
£3,271 GBP
$4,390 USD
View
B+
Retailer 3
-
£3,366 GBP
$4,517 USD
View
B+
Retailer 4
-
£3,407 GBP
$4,572 USD
View
B
Retailer 5
-
£4,512 GBP
View
Most Expensive
B
Yorxs
RB4510 · Nov 2
£4,534 GBP
€5,795 EUR
View
5 more retailers have this diamond
Prices start from £3,214 GBPSave up to £1,320 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+
1.28ct Round
£3,214 GBP