Buy Octagon Shape 20x15 mm Gems
Bi-color
Black Octagon Shape 20x15 mm Gems
Blue
Brown
Golden
Gray Octagon Shape 20x15 mm Gems
Green
Multicolor
Orange
Pink Octagon Shape 20x15 mm Gems
Purple
Red
Turquoise
Violet Octagon Shape 20x15 mm Gems
White
Yellow
Clear Colors
Single
Pairs
Lots
Faceted
Cabochons
Showing results for
Sort By:
Price - High to Low
Price - Low to High
Size - Largest to Smallest
Size - Smallest to Largest
Weight - High to Low
Weight - Low to High
Gemtypes in Category:
Amethyst (43)
Hematite (9)
Kunzite (1)
Tourmaline (1)
Clear All
ID:
692347
Weight:
24.65ct
Size:
20 x 15 mm (calibrated)
Clarity:
VS
Content:
1 pc
Price:
$
172.55
Item in Stock
More Options & Item Details
ID:
715570
Weight:
19.30ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
185.28
Item in Stock
More Options & Item Details
ID:
692910
Weight:
21.61ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
181.52
Item in Stock
More Options & Item Details
ID:
692721
Weight:
22.72ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
190.85
Item in Stock
More Options & Item Details
ID:
716441
Weight:
18.67ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
179.23
Item in Stock
More Options & Item Details
ID:
692509
Weight:
21.50ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
180.60
Item in Stock
More Options & Item Details
ID:
555562
Weight:
21.42ct
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
26.02
Item in Stock
More Options & Item Details
ID:
491895
Weight:
37.51ct (total)
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
44.06
Item in Stock
More Options & Item Details
ID:
692506
Weight:
22.92ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
192.53
Item in Stock
More Options & Item Details
ID:
692507
Weight:
20.24ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
170.02
Item in Stock
More Options & Item Details
ID:
491896
Weight:
40.49ct (total)
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
43.25
Item in Stock
More Options & Item Details
ID:
715759
Weight:
22.10ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
212.16
Item in Stock
More Options & Item Details
ID:
715394
Weight:
22.47ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
215.71
Item in Stock
More Options & Item Details
ID:
695901
Weight:
29.93ct
Size:
20 x 15 mm (calibrated)
Clarity:
VS
Content:
1 pc
Price:
$
897.90
Item in Stock
More Options & Item Details
ID:
692720
Weight:
17.51ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS-VS
Content:
1 pc
Price:
$
147.08
Item in Stock
More Options & Item Details
ID:
692356
Weight:
21.40ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
179.76
Item in Stock
More Options & Item Details
ID:
692512
Weight:
25.46ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
213.86
Item in Stock
More Options & Item Details
ID:
716070
Weight:
18.55ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
178.08
Item in Stock
More Options & Item Details
ID:
692508
Weight:
24.25ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
203.70
Item in Stock
More Options & Item Details
ID:
515497
Weight:
19.67ct
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
25.97
Item in Stock
More Options & Item Details
ID:
692716
Weight:
22.65ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS-VS
Content:
1 pc
Price:
$
190.26
Item in Stock
More Options & Item Details
ID:
692358
Weight:
22.52ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
189.17
Item in Stock
More Options & Item Details
ID:
692723
Weight:
22.42ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
188.33
Item in Stock
More Options & Item Details
ID:
692717
Weight:
23.68ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
198.91
Item in Stock
More Options & Item Details
ID:
692504
Weight:
22.46ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
188.66
Item in Stock
More Options & Item Details
ID:
716063
Weight:
18.23ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
175.01
Item in Stock
More Options & Item Details
ID:
701486
Weight:
25.94ct
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
155.64
Item in Stock
More Options & Item Details
ID:
716438
Weight:
22.11ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
212.26
Item in Stock
More Options & Item Details
ID:
692348
Weight:
23.96ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
201.26
Item in Stock
More Options & Item Details
ID:
692713
Weight:
24.08ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS-VS
Content:
1 pc
Price:
$
202.27
Item in Stock
More Options & Item Details
ID:
515494
Weight:
19.55ct
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
25.81
Item in Stock
More Options & Item Details
ID:
692357
Weight:
22.77ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
191.27
Item in Stock
More Options & Item Details
ID:
491900
Weight:
36.84ct (total)
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
39.35
Item in Stock
More Options & Item Details
ID:
715400
Weight:
22.20ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
213.12
Item in Stock
More Options & Item Details
ID:
692719
Weight:
21.16ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
177.74
Item in Stock
More Options & Item Details
ID:
491893
Weight:
34.87ct (total)
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
40.96
Item in Stock
More Options & Item Details
ID:
692914
Weight:
24.54ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
206.14
Item in Stock
More Options & Item Details
ID:
692513
Weight:
21.82ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
183.29
Item in Stock
More Options & Item Details
ID:
692911
Weight:
24.01ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
201.68
Item in Stock
More Options & Item Details
ID:
692503
Weight:
20.96ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
176.06
Item in Stock
More Options & Item Details
ID:
491902
Weight:
41.25ct (total)
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
2 pcs
Price:
$
48.46
Item in Stock
More Options & Item Details
ID:
716107
Weight:
22.23ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
213.41
Item in Stock
More Options & Item Details
ID:
692511
Weight:
22.05ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
185.22
Item in Stock
More Options & Item Details
ID:
692354
Weight:
23.19ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
194.80
Item in Stock
More Options & Item Details
ID:
692510
Weight:
22.71ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
190.76
Item in Stock
More Options & Item Details
ID:
515489
Weight:
17.55ct
Size:
20 x 15 mm (calibrated)
Clarity:
Opaque
Content:
1 pc
Price:
$
23.17
Item in Stock
More Options & Item Details
ID:
692514
Weight:
22.70ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS-VS
Content:
1 pc
Price:
$
190.68
Item in Stock
More Options & Item Details
ID:
692912
Weight:
19.16ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
160.94
Item in Stock
More Options & Item Details
ID:
692353
Weight:
20.89ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
175.48
Item in Stock
More Options & Item Details
ID:
692915
Weight:
24.90ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
209.16
Item in Stock
More Options & Item Details
ID:
692722
Weight:
23.50ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
197.40
Item in Stock
More Options & Item Details
ID:
692712
Weight:
24.96ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS-VS
Content:
1 pc
Price:
$
209.66
Item in Stock
More Options & Item Details
ID:
692352
Weight:
21.90ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS
Content:
1 pc
Price:
$
183.96
Item in Stock
More Options & Item Details
ID:
692718
Weight:
23.51ct
Size:
20 x 15 mm (calibrated)
Clarity:
VVS-VS
Content:
1 pc
Price:
$
197.48
Item in Stock
More Options & Item Details
GemSelect Certified Store Reviews
GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!
Overall Rating -> 10
I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.
Posted By Maggie in August, 2025
Source: Bizrate
Overall Rating -> 10
I found exactly what I was looking for and ordered it. I like how you give information on the stones I'm buying. Glad I found you!
Posted By TheP in April, 2025
Source: Bizrate
Overall Rating -> 10
excellent deals-excellent service-fair prices
Posted By JD in April, 2025
Source: Bizrate
Overall Rating -> 10
I am never let down by GemSelect. I love that you get the exact stone you want. Shipping is always in a few days. I have spread the word about GemSelect on social media jewelry creating groups that I attend. This sapphire is going to make one gorgeous ring
Posted By Desertchick in April, 2025
Source: Bizrate
Overall Rating -> 10
the selection is good as are the prices
Posted By Old man in August, 2025
Source: Bizrate
Overall Rating -> 10
It was easy and to the point
Posted By Victorius in May, 2025
Source: Bizrate
Overall Rating -> 10
Easy picking, fast checkout, secure shipping. Cana't ask for anything more than efficiency and a good price.
Posted By Beman in September, 2025
Source: Bizrate
Overall Rating -> 8
great experience
Posted By T in December, 2024
Source: Bizrate
Overall Rating -> 9
It was a good experience looking for and finding a nice amethyst stone
Posted By N/a in May, 2025
Source: Bizrate