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Round|Natural|GIA

1.55ct M SI1 Round Natural Diamond

GD • M/SI1 • GIA 6127528766

Certificate GIA 6127528766

Diamond specifications and retailer prices

From £3,370 GBP
As of November 4, 2026
Save £1,345 GBP (29%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £4,715 GBP at Cape Diamonds · As of November 5, 2026
View at Cape Diamonds

About this 1.55ct natural round diamond

This 1.55ct natural round sits in the one-and-a-half to two carat band, graded M colour (faint-tinted) and SI1 clarity (slightly-included), with a standard cut grade and certified by GIA 6127528766. Listed at 7 retailers as of November 4, 2026, with prices from £3,370 to £4,715, a £1,345 spread on the same certified stone. Cape Diamonds lists it at £4,715. 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

1.55
Carat
M
Colour
SI1
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle37.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 6127528766
Dimensions7.17 × 7.20 × 4.69 mm
L/W Ratio1.00
Key to symbols
Feather, Crystal, Indented Natural
Top View
7.17 mm7.20 mm1.55 ctM / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6127528766
Side View
Table 59.0%Crown 37.5°Girdle: STK-THKPavilion 41.8°Culet: NoneDepth 65.3%

Caratlytics Score

How it works →
B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £4,715 GBP|Low: £3,370 GBP|High: £4,750 GBP|Avg: £3,976 GBP|+1.4%
Cape Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 5£3,370 GBP
Retailer 4£3,592 GBP
Retailer 3£4,100 GBP
Retailer 2£4,208 GBP
Cape Diamonds£4,715 GBP

39 data points across 5 retailers

7 retailers£3,370 GBP to £4,715 GBP

B
Cheapest Retailer
-
£3,370 GBP
B
Retailer 2
-
£3,592 GBP
View
B
Retailer 3
-
£3,630 GBP
View
C
Retailer 4
-
£3,977 GBP
View
C
Retailer 5
-
£4,100 GBP
View
C
Retailer 6
-
£4,208 GBP
View
Most Expensive
C
Cape Diamonds
cert_6127528766 · Nov 5
£4,715 GBP
ZAR 102,521 ZAR
View
6 more retailers have this diamond
Prices start from £3,370 GBPSave up to £1,345 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
1.55ct Round
£3,370 GBP