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1.51ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 2125868320

Certificate GIA 2125868320

Diamond specifications and retailer prices

From £6,633 GBP
$8,887 USD
As of October 30, 2026
Save £6,136 GBP (48%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £12,768 GBP at Diamond Quarter · As of October 31, 2026
View at Diamond Quarter

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2125868320. Listed at 19 retailers as of October 30, 2026, with prices from £6,633 to £12,768, a £6,136 spread on the same certified stone. Diamond Quarter lists it at £12,768. 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

1.51
Carat
H
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2125868320
Dimensions7.37 × 7.35 × 4.56 mm
L/W Ratio1.00
Culet sizeNone
Top View
7.37 mm7.35 mm1.51 ctH / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 2125868320
Side View
Table 57.0%CrownGirdle: MediumPavilionCulet: NoneDepth 62.0%

Caratlytics Score

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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: Oct 30
Current: £11,387 GBP|Low: £6,076 GBP|High: £12,152 GBP|Avg: £8,766 GBP|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 6£6,489 GBP
Retailer 7£7,291 GBP
Retailer 10£7,291 GBP
Retailer 11£7,899 GBP
Retailer 4£7,928 GBP
Retailer 8£8,020 GBP
Retailer 5£8,733 GBP
Retailer 9£9,114 GBP
Retailer 3£9,595 GBP
Retailer 1£11,387 GBP
Retailer 2£12,152 GBP

40 data points across 11 retailers

19 retailers£6,633 GBP to £12,768 GBP

Retailer 1
-
£6,489 GBP
$8,695 USD
Price last confirmed 7 days ago
B
Retailer 2
-
£6,633 GBP
$8,887 USD
View
B
Retailer 3
-
£6,765 GBP
$9,064 USD
View
B
Retailer 4
-
£7,017 GBP
CA$13,059 CAD
View
B
Retailer 5
-
£7,291 GBP
$9,769 USD
View
B
Retailer 6
-
£7,291 GBP
$9,769 USD
View
Final sale: no returns
B
Retailer 7
-
£7,899 GBP
$10,584 USD
View
B
Retailer 8
-
£7,928 GBP
View
B
Retailer 9
-
£8,020 GBP
$10,746 USD
View
B
Retailer 10
-
£8,413 GBP
$11,272 USD
View
B
Retailer 11
-
£8,553 GBP
$11,460 USD
View
B
Retailer 12
-
£8,553 GBP
$11,460 USD
View
B
Retailer 13
-
£8,733 GBP
€11,144 EUR
View
B
Retailer 14
-
£8,844 GBP
$11,850 USD
View
B
Retailer 15
-
£9,114 GBP
$12,212 USD
View
Retailer 16
-
£9,595 GBP
$12,856 USD
View
Price last confirmed 9 days ago
B
Retailer 17
-
£11,387 GBP
View
B
Retailer 18
-
£12,152 GBP
$16,282 USD
View
Most Expensive
B
Diamond Quarter
1.51SI2H2120A7B6N · Oct 31
£12,768 GBP
View
18 more retailers have this diamond
Prices start from £6,633 GBPSave up to £6,136 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
1.51ct Round
£6,633 GBP