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Radiant|Natural|GIA

2.51ct I SI1 Radiant Natural Diamond

EX • I/SI1 • GIA 1518171703

Certificate GIA 1518171703

Diamond specifications and retailer prices

From HK$95,095 HKD
$12,120 USD
As of November 3, 2026
Save HK$41,579 HKD (30%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: HK$151,249 HKD at NZ Jewellers · As of September 27, 2026
View at NZ Jewellers

About this 2.51ct natural radiant diamond

This 2.51ct natural radiant sits in the two to three carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1518171703. Listed at 9 retailers as of November 2, 2026, with a 44% 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

2.51
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44.73°
Pavilion angle31.36°
OriginNatural
Grading LabGIA
CertificateGIA 1518171703
Dimensions8.69 × 6.69 × 4.60 mm
L/W Ratio1.30
Girdle conditionVery Thick
Key to symbols
Feather, Cavity, Needle
Top View
8.69 mm6.69 mm2.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1518171703
Side View
Table 66.0%Crown 44.73°GirdlePavilion 31.36°CuletDepth 68.7%

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: Nov 3
Current: HK$100,682 HKD|Low: HK$95,095 HKD|High: HK$143,440 HKD|Avg: HK$109,180 HKD|-4.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 3HK$95,095 HKD
Retailer 4HK$95,150 HKD
Retailer 1HK$100,682 HKD
Retailer 7HK$102,250 HKD
Retailer 6HK$106,330 HKD
Retailer 5HK$111,925 HKD
Retailer 2HK$136,674 HKD

37 data points across 7 retailers

9 retailersHK$95,095 HKD to HK$136,674 HKD

A
Cheapest Retailer
-
HK$95,095 HKD
$12,120 USD
Retailer 2
-
HK$95,150 HKD
A$18,657 AUD
View
Price last confirmed 10 days ago
A
Retailer 3
-
HK$100,682 HKD
£10,104 GBP
View
Retailer 4
-
HK$106,848 HKD
$13,618 USD
View
Price last confirmed 33 days ago
Retailer 5
-
HK$108,519 HKD
$13,831 USD
View
Price last confirmed 38 days ago
Retailer 6
-
HK$108,519 HKD
$13,831 USD
View
Price last confirmed 26 days ago
A
Retailer 7
-
HK$136,674 HKD
£13,716 GBP
View
Retailer 8
-
HK$151,249 HKD
$19,277 USD
View
Price last confirmed 27 days ago
Most Expensive
NZ Jewellers
4d56b567-6ce3-4faf-84e9-24a3f1d341c9 · Sep 27
HK$151,249 HKD
$19,277 USD
View
Price last confirmed 36 days ago
8 more retailers have this diamond
Prices start from HK$95,095 HKDSave up to HK$41,579 HKD

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 Radiant
HK$95,095 HKD