Round|Natural|GIA

1.51ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 2136190577

Certificate GIA 2136190577

Diamond specifications and retailer prices

From £9,751 GBP
$13,065 USD
As of November 1, 2026
Save £6,615 GBP (40%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £19,581 GBP at Diamond Quarter · As of October 29, 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 G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2136190577. Listed at 20 retailers as of November 1, 2026, with a 68% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2136190577
Dimensions7.36 × 7.34 × 4.56 mm
L/W Ratio1.00
Culet sizeNone
Top View
7.36 mm7.34 mm1.51 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2136190577
Side View
Table 56.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 62.1%

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: £11,647 GBP|Low: £9,751 GBP|High: £17,607 GBP|Avg: £12,491 GBP|-0.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
November 2, 2026
Retailer 16£9,751 GBP
Retailer 11£10,190 GBP
Retailer 2£10,241 GBP
Retailer 4£10,432 GBP
Retailer 19£10,926 GBP
Retailer 7£11,140 GBP
Retailer 1£11,647 GBP
Retailer 15£11,701 GBP
Retailer 3£11,882 GBP
Retailer 9£12,068 GBP
Retailer 5£12,532 GBP
Retailer 6£12,568 GBP
Retailer 17£12,568 GBP
Retailer 8£12,937 GBP
Retailer 18£12,986 GBP
Retailer 13£13,430 GBP
Retailer 10£15,781 GBP
Retailer 14£16,366 GBP
Retailer 12£17,398 GBP

41 data points across 19 retailers

20 retailers£9,751 GBP to £16,366 GBP

B+
Cheapest Retailer
-
£9,751 GBP
$13,065 USD
B
Retailer 2
-
£10,190 GBP
$13,653 USD
View
B
Retailer 3
-
£10,241 GBP
$13,722 USD
View
B
Retailer 4
-
£10,432 GBP
CA$19,414 CAD
View
B
Retailer 5
-
£10,926 GBP
$14,640 USD
View
B
Retailer 6
-
£11,140 GBP
$14,926 USD
View
B
Retailer 7
-
£11,647 GBP
View
Retailer 8
-
£11,701 GBP
A$24,121 AUD
View
Price last confirmed 9 days ago
B
Retailer 9
-
£11,882 GBP
$15,921 USD
View
B
Retailer 10
-
£12,068 GBP
$16,170 USD
View
B
Retailer 11
-
£12,532 GBP
$16,792 USD
View
B
Retailer 12
-
£12,568 GBP
$16,840 USD
View
B
Retailer 13
-
£12,568 GBP
$16,840 USD
View
B
Retailer 14
-
£12,937 GBP
$17,334 USD
View
B
Retailer 15
-
£12,986 GBP
$17,400 USD
View
B
Retailer 16
-
£13,430 GBP
€17,138 EUR
View
B
Retailer 17
-
£15,781 GBP
$21,145 USD
View
B
Retailer 18
-
£16,366 GBP
ZAR 354,262 ZAR
View
Retailer 19
-
£17,398 GBP
View
Price under review
Most Expensive
Diamond Quarter
1.51SI1G217770E1N · Oct 29
£19,581 GBP
View
Price under review
19 more retailers have this diamond
Prices start from £9,751 GBPSave up to £6,615 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
£9,751 GBP