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Round|Natural|GIA

3.18ct M I1 Round Natural Diamond

EX • M/I1 • GIA 5231021840

Certificate GIA 5231021840

Diamond specifications and retailer prices

From £13,244 GBP
As of November 1, 2026
Save £8,290 GBP (38%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £21,533 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 3.18ct natural round diamond

This 3.18ct natural round sits in the three to five carat band, graded M colour (faint-tinted) and I1 clarity (included), with a top-tier cut grade and certified by GIA 5231021840. Listed at 9 retailers as of November 1, 2026, with prices from £13,244 to £21,533, a £8,290 spread on the same certified stone. NZ Jewellers lists it at £21,533. At this carat range, natural pricing varies dramatically across retailers, so the cross-retailer spread on this exact stone is your single best indicator of fair price.

The 4Cs

3.18
Carat
M
Colour
I1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 5231021840
Dimensions9.57 × 9.54 × 5.76 mm
L/W Ratio1.00
Top View
9.57 mm9.54 mm3.18 ctM / I1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5231021840
Side View
Table 56.0%CrownGirdle: THN-STKPavilionCulet: NoneDepth 60.3%

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 1
Current: £21,533 GBP|Low: £13,244 GBP|High: £21,533 GBP|Avg: £16,463 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 3£13,244 GBP
Retailer 9£13,773 GBP
Retailer 4£13,973 GBP
Retailer 6£15,200 GBP
Retailer 5£15,960 GBP
Retailer 8£16,467 GBP
Retailer 7£17,100 GBP
Retailer 2£17,661 GBP
Retailer 10£19,119 GBP
NZ Jewellers£21,533 GBP

23 data points across 10 retailers

9 retailers£13,244 GBP to £21,533 GBP

B
Cheapest Retailer
-
£13,244 GBP
B
Retailer 2
-
£13,973 GBP
View
Retailer 3
-
£15,200 GBP
View
Price last confirmed 8 days ago
C
Retailer 4
-
£15,960 GBP
View
C
Retailer 5
-
£16,467 GBP
View
C
Retailer 6
-
£17,100 GBP
View
C
Retailer 7
-
£17,661 GBP
View
C
Retailer 8
-
£17,712 GBP
View
Most Expensive
C
NZ Jewellers
aa35406b-0523-45f1-9395-f1aad5eda815 · Nov 5
£21,533 GBP
$28,982 USD
View
8 more retailers have this diamond
Prices start from £13,244 GBPSave up to £8,290 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
3.18ct Round
£13,244 GBP