Round|Natural|GIA

2.51ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 2566649853

Certificate GIA 2566649853

Diamond specifications and retailer prices

From $21,773 USD
HK$170,100 HKD
As of October 30, 2026
Save $18,498 USD (46%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $40,270 USD at MOH London · As of November 1, 2026
View at MOH London

About this 2.51ct natural round diamond

This 2.51ct natural round sits in the two to three carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566649853. Listed at 19 retailers as of October 30, 2026, with prices from $21,773 to $40,270, a $18,498 spread on the same certified stone. MOH London lists it at $40,270. 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

2.51
Carat
G
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2566649853
Dimensions8.65 × 8.69 × 5.36 mm
L/W Ratio1.00
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
8.65 mm8.69 mm2.51 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2566649853
Side View
Table 59.0%Crown 35.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $40,270 USD|Low: $21,734 USD|High: $40,486 USD|Avg: $28,250 USD|-0.5%
MOH London
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 1, 2026
Retailer 4$21,773 USD
Retailer 8$22,001 USD
Retailer 12$22,290 USD
Retailer 3$23,160 USD
Retailer 5$23,476 USD
Retailer 11$24,440 USD
Retailer 16$25,100 USD
Retailer 17$25,785 USD
Retailer 14$25,800 USD
Retailer 6$26,860 USD
Retailer 18$27,075 USD
Retailer 19$27,934 USD
Retailer 13$28,441 USD
Retailer 7$29,009 USD
Retailer 10$29,311 USD
Retailer 2$31,147 USD
Retailer 15$35,655 USD
Retailer 9$36,009 USD
MOH London$40,270 USD

16 data points across 19 retailers

19 retailers$21,773 USD to $40,270 USD

A
Cheapest Retailer
-
$21,773 USD
HK$170,100 HKD
A
Retailer 2
-
$22,001 USD
₹2,095,301 INR
View
A
Retailer 3
-
$22,290 USD
View
A
Retailer 4
-
$23,160 USD
View
A
Retailer 5
-
$23,476 USD
View
Retailer 6
-
$24,960 USD
View
Price last confirmed 14 days ago
B+
Retailer 7
-
$25,100 USD
View
B+
Retailer 8
-
$25,785 USD
View
B+
Retailer 9
-
$25,800 USD
£20,315 GBP
View
B+
Retailer 10
-
$26,860 USD
View
B+
Retailer 11
-
$27,075 USD
View
B+
Retailer 12
-
$27,934 USD
View
B+
Retailer 13
-
$28,441 USD
£22,394 GBP
View
B+
Retailer 14
-
$29,009 USD
View
Retailer 15
-
$29,311 USD
View
Price last confirmed 8 days ago
B
Retailer 16
-
$31,147 USD
€29,664 EUR
View
B
Retailer 17
-
$35,655 USD
ZAR 576,015 ZAR
View
B
Retailer 18
-
$36,009 USD
View
Most Expensive
B
MOH London
6829E11F8 · Nov 1
$40,270 USD
£31,709 GBP
View
18 more retailers have this diamond
Prices start from $21,773 USDSave up to $18,498 USD

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.

A
2.51ct Round
$21,773 USD