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Round|Natural|GIA

1.51ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 2136190577

Certificate GIA 2136190577

Diamond specifications and retailer prices

From $18,599 AUD
$13,065 USD
As of November 1, 2026
Save $12,619 AUD (40%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $37,350 AUD at Diamond Quarter · As of November 2, 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: $22,217 AUD|Low: $18,599 AUD|High: $33,585 AUD|Avg: $23,826 AUD|-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$18,599 AUD
Retailer 11$19,436 AUD
Retailer 2$19,535 AUD
Retailer 4$19,899 AUD
Retailer 19$20,842 AUD
Retailer 7$21,249 AUD
Retailer 1$22,217 AUD
Retailer 15$22,320 AUD
Retailer 3$22,665 AUD
Retailer 9$23,020 AUD
Retailer 5$23,905 AUD
Retailer 6$23,973 AUD
Retailer 17$23,973 AUD
Retailer 8$24,677 AUD
Retailer 18$24,771 AUD
Retailer 13$25,618 AUD
Retailer 10$30,102 AUD
Retailer 14$31,218 AUD
Retailer 12$33,185 AUD

41 data points across 19 retailers

20 retailers$18,599 AUD to $31,218 AUD

B+
Cheapest Retailer
-
$18,599 AUD
$13,065 USD
B
Retailer 2
-
$19,436 AUD
$13,653 USD
View
B
Retailer 3
-
$19,535 AUD
$13,722 USD
View
B
Retailer 4
-
$19,899 AUD
CA$19,414 CAD
View
B
Retailer 5
-
$20,842 AUD
$14,640 USD
View
B
Retailer 6
-
$21,249 AUD
$14,926 USD
View
B
Retailer 7
-
$22,217 AUD
£12,288 GBP
View
Retailer 8
-
$22,320 AUD
View
Price last confirmed 9 days ago
B
Retailer 9
-
$22,665 AUD
$15,921 USD
View
B
Retailer 10
-
$23,020 AUD
$16,170 USD
View
B
Retailer 11
-
$23,905 AUD
$16,792 USD
View
B
Retailer 12
-
$23,973 AUD
$16,840 USD
View
B
Retailer 13
-
$23,973 AUD
$16,840 USD
View
B
Retailer 14
-
$24,677 AUD
$17,334 USD
View
B
Retailer 15
-
$24,771 AUD
$17,400 USD
View
B
Retailer 16
-
$25,618 AUD
€17,138 EUR
View
B
Retailer 17
-
$30,102 AUD
$21,145 USD
View
B
Retailer 18
-
$31,218 AUD
ZAR 354,262 ZAR
View
Retailer 19
-
$33,185 AUD
£18,355 GBP
View
Price under review
Most Expensive
Diamond Quarter
1.51SI1G217770E1N · Nov 2
$37,350 AUD
£20,658 GBP
View
Price under review
19 more retailers have this diamond
Prices start from $18,599 AUDSave up to $12,619 AUD

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
$18,599 AUD