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Round|Natural|GIA

1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6405890761

Certificate GIA 6405890761

Diamond specifications and retailer prices

From HK$98,071 HKD
$12,500 USD
As of October 25, 2026
Save HK$77,236 HKD (44%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: HK$203,582 HKD 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6405890761. Listed at 22 retailers as of October 25, 2026, with a 79% 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
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6405890761
Dimensions7.42 × 7.39 × 4.49 mm
L/W Ratio1.00
Top View
7.42 mm7.39 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6405890761
Side View
Table 59.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 60.6%

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: Oct 25
Current: HK$116,688 HKD|Low: HK$98,040 HKD|High: HK$185,949 HKD|Avg: HK$128,212 HKD|-5.9%
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
October 30, 2026
Retailer 14HK$98,071 HKD
Retailer 2HK$102,080 HKD
Retailer 7HK$102,645 HKD
Retailer 16HK$104,502 HKD
Retailer 13HK$109,604 HKD
Retailer 8HK$112,743 HKD
Retailer 1HK$116,688 HKD
Retailer 12HK$119,979 HKD
Retailer 5HK$120,957 HKD
Retailer 3HK$126,551 HKD
Retailer 15HK$126,551 HKD
Retailer 4HK$129,595 HKD
Retailer 6HK$130,788 HKD
Retailer 9HK$135,482 HKD
Retailer 11HK$163,164 HKD
Retailer 10HK$175,307 HKD

42 data points across 16 retailers

22 retailersHK$98,071 HKD to HK$175,307 HKD

B+
Cheapest Retailer
-
HK$98,071 HKD
$12,500 USD
B
Retailer 2
-
HK$102,080 HKD
$13,011 USD
View
B
Retailer 3
-
HK$102,645 HKD
$13,083 USD
View
B
Retailer 4
-
HK$104,502 HKD
CA$18,500 CAD
View
B
Retailer 5
-
HK$105,320 HKD
A$20,652 AUD
View
B
Retailer 6
-
HK$109,604 HKD
$13,970 USD
View
B
Retailer 7
-
HK$111,652 HKD
$14,231 USD
View
B
Retailer 8
-
HK$112,743 HKD
$14,370 USD
View
Final sale: no returns
B
Retailer 9
-
HK$116,688 HKD
£11,711 GBP
View
B
Retailer 10
-
HK$119,098 HKD
$15,180 USD
View
B
Retailer 11
-
HK$119,979 HKD
A$23,527 AUD
View
B
Retailer 12
-
HK$120,957 HKD
$15,417 USD
View
B
Retailer 13
-
HK$125,610 HKD
$16,010 USD
View
B
Retailer 14
-
HK$126,551 HKD
$16,130 USD
View
B
Retailer 15
-
HK$126,551 HKD
$16,130 USD
View
B
Retailer 16
-
HK$129,595 HKD
$16,518 USD
View
B
Retailer 17
-
HK$130,788 HKD
$16,670 USD
View
B
Retailer 18
-
HK$135,482 HKD
€16,446 EUR
View
B
Retailer 19
-
HK$158,177 HKD
$20,161 USD
View
B
Retailer 20
-
HK$163,164 HKD
ZAR 335,971 ZAR
View
B
Retailer 21
-
HK$175,307 HKD
£17,594 GBP
View
Most Expensive
Diamond Quarter
1.51SI1E646109B5N · Oct 29
HK$203,582 HKD
£20,432 GBP
View
Price under review
21 more retailers have this diamond
Prices start from HK$98,071 HKDSave up to HK$77,236 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.

B+
1.51ct Round
HK$98,071 HKD