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Round|Natural|GIA

3.18ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 6425577637

Certificate GIA 6425577637

Diamond specifications and retailer prices

From £37,320 GBP
As of November 1, 2026
Save £30,472 GBP (45%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £67,792 GBP at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 3.18ct natural round diamond

This 3.18ct natural round sits in the three to five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6425577637. Listed at 15 retailers as of November 1, 2026, with prices from £37,320 to £67,792, a £30,472 spread on the same certified stone. Diamond Quarter lists it at £67,792. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

3.18
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle33°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 6425577637
Dimensions9.68 × 9.62 × 5.63 mm
L/W Ratio1.01
Top View
9.68 mm9.62 mm3.18 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6425577637
Side View
Table 62.0%Crown 33°Girdle: THN-MEDPavilion 41°Culet: NoneDepth 58.5%

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 1
Current: £39,252 GBP|Low: £37,320 GBP|High: £51,290 GBP|Avg: £43,459 GBP|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 4£37,320 GBP
Retailer 1£39,252 GBP
Retailer 2£42,374 GBP
Retailer 3£49,658 GBP
Retailer 5£51,290 GBP

46 data points across 5 retailers

15 retailers£37,320 GBP to £67,792 GBP

B+
Cheapest Retailer
-
£37,320 GBP
B+
Retailer 2
-
£39,252 GBP
View
B+
Retailer 3
-
£39,633 GBP
View
B+
Retailer 4
-
£40,676 GBP
View
B+
Retailer 5
-
£41,192 GBP
View
B+
Retailer 6
-
£41,806 GBP
View
B+
Retailer 7
-
£42,374 GBP
View
B+
Retailer 8
-
£44,339 GBP
View
B+
Retailer 9
-
£45,530 GBP
View
B+
Retailer 10
-
£45,530 GBP
View
B+
Retailer 11
-
£46,694 GBP
View
B+
Retailer 12
-
£47,046 GBP
View
B
Retailer 13
-
£49,658 GBP
View
B
Retailer 14
-
£51,526 GBP
View
Most Expensive
B
Diamond Quarter
3.18SI1D64377A02N · Nov 5
£67,792 GBP
View
14 more retailers have this diamond
Prices start from £37,320 GBPSave up to £30,472 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
£37,320 GBP