90,000+Happy Customers
20+Years
WorldwideShipping
Cart
Free Report Included
Worldwide Shipping
30 Day Returns
Help Center Shipping Payment and Checkout Returns Certificates Contact Us
Home › Calibrated Gemstones › Octagon Shape 27 x 20 mm Gems

Calibrated 27 x 20 mm Octagon Shape Gemstones | GemSelect

Exact Match not Available: Go Back
1.52ctw Natural Multicolor Opal, Oval, Opaque, Photo A

1.52ctw Natural Multicolor Opal, Oval, Opaque

Opal

1.52ct total2 pcs
$ 49.96
8 x 6 mm (calibrated)
View Details
Add to Cart
22.69ct Natural Intense Navy Blue Lapis Lazuli, Cushion, Opaque, Photo A
Lapis Lazuli Product Video (550806)

22.69ct Natural Intense Navy Blue Lapis Lazuli, Cushion, Opaque

Lapis Lazuli

22.69ct1 pc
$ 42.51
20 x 15 mm (calibrated)
View Details
Add to Cart
1.09ct Natural Deep Orange-Gold Citrine, Pear Shape, VVS-VS, Photo A

1.09ct Natural Deep Orange-Gold Citrine, Pear Shape, VVS-VS

Citrine

1.09ct1 pc
$ 9.55
9 x 6 mm (calibrated)
View Details
Add to Cart
14.06ct Natural Medium Green Maw-Sit-Sit, Oval, Opaque, Photo A

14.06ct Natural Medium Green Maw-Sit-Sit, Oval, Opaque

Maw-Sit-Sit

14.06ct1 pc
$ 46.21
14.9 x 13 mm
View Details
Add to Cart
1.13ctw Natural London Blue Topaz, Oval, VS, Photo A

1.13ctw Natural London Blue Topaz, Oval, VS

Topaz

1.13ct total2 pcs
$ 9.01
6 x 4 mm (calibrated)
View Details
Add to Cart
5.25ctw Natural Olive Green Prehnite, Oval, Transparent/Translucent, Photo A

5.25ctw Natural Olive Green Prehnite, Oval, Transparent/Translucent

Prehnite

5.25ct total2 pcs
$ 28.77
9.5 x 7.1 mm
View Details
Add to Cart
6.64ct Natural Medium Pink Rose Quartz, Octagon / Emerald Cut, Transparent, Photo A

6.64ct Natural Medium Pink Rose Quartz, Octagon / Emerald Cut, Transparent

Rose Quartz

6.64ct1 pc
$ 36.37
11 x 11 mm (calibrated)
View Details
Add to Cart
3.88ct Natural Pale Yellow Color-Change Diaspore, Cushion, VS, Photo A
Color-Change Diaspore Product Video (400536)

3.88ct Natural Pale Yellow Color-Change Diaspore, Cushion, VS

Color-Change Diaspore

3.88ct1 pc
$ 966.12
21.1 x 4.9 mm
View Details
Add to Cart
2.63ctw Natural White Zircon, Oval, VVS-VS, Photo A

2.63ctw Natural White Zircon, Oval, VVS-VS

Zircon

2.63ct total2 pcs
$ 15.59
7 x 5 mm (calibrated)
View Details
Add to Cart
1.62ct Natural Reddish Orange Hessonite Garnet, Octagon / Emerald Cut, VS, Photo A

1.62ct Natural Reddish Orange Hessonite Garnet, Octagon / Emerald Cut, VS

Hessonite Garnet

1.62ct1 pc
$ 31.96
7 x 5 mm (calibrated)
View Details
Add to Cart
3.31ctw Natural Deep Red Pyrope Garnet, Octagon / Emerald Cut, VS, Photo A

3.31ctw Natural Deep Red Pyrope Garnet, Octagon / Emerald Cut, VS

Pyrope Garnet

3.31ct total6 pcs
$ 23.07
6 x 4 mm (calibrated)
View Details
Add to Cart
5.41ct Natural Medium Yellow Agate, Oval, Translucent, Photo A

5.41ct Natural Medium Yellow Agate, Oval, Translucent

Agate

5.41ct1 pc
$ 11.85
13 x 11 mm (calibrated)
View Details
Add to Cart
1.84ct Natural Light Yellow Beryl, Oval, VVS, Photo A

1.84ct Natural Light Yellow Beryl, Oval, VVS

Beryl

1.84ct1 pc
$ 36.65
9.6 x 7.7 mm
View Details
Add to Cart
2.11ct Natural Swiss Blue Topaz, Octagon / Emerald Cut, VVS, Photo A

2.11ct Natural Swiss Blue Topaz, Octagon / Emerald Cut, VVS

Topaz

2.11ct1 pc
$ 16.82
8 x 6 mm (calibrated)
View Details
Add to Cart
2.95ct Natural Light Green Prehnite, Pear Shape, Transparent/Translucent, Photo A

2.95ct Natural Light Green Prehnite, Pear Shape, Transparent/Translucent

Prehnite

2.95ct1 pc
$ 16.17
10 x 7 mm (calibrated)
View Details
Add to Cart
3.08ct Natural Multicolor Opal Triplet, Fancy, Opaque, Photo A

3.08ct Natural Multicolor Opal Triplet, Fancy, Opaque

Opal Triplet

3.08ct1 pc
$ 76.69
15.3 x 8.8 mm
View Details
Add to Cart
4.18ctw Natural Raspberry Red Pyrope Garnet, Square, VS, Photo A

4.18ctw Natural Raspberry Red Pyrope Garnet, Square, VS

Pyrope Garnet

4.18ct total10 pcs
$ 32.06
4 x 4 mm (calibrated)
View Details
Add to Cart
18.53ct Natural Multicolor Labradorite, Oval, Opaque, Photo A

18.53ct Natural Multicolor Labradorite, Oval, Opaque

Labradorite

18.53ct1 pc
$ 16.62
24.3 x 17.2 mm
View Details
Add to Cart
7.95ct Natural Multicolor Agate, Oval, Opaque, Photo A

7.95ct Natural Multicolor Agate, Oval, Opaque

Agate

7.95ct1 pc
$ 7.92
13 x 11 mm (calibrated)
View Details
Add to Cart
8.34ct Natural Pecan Brown Hessonite Garnet, Oval, Translucent, Photo A

8.34ct Natural Pecan Brown Hessonite Garnet, Oval, Translucent

Hessonite Garnet

8.34ct1 pc
$ 41.53
12.9 x 10 mm
View Details
Add to Cart
1.75ct Natural Deep Violet Blue Tanzanite, Pear Shape, VS, Photo A
Tanzanite Product Video (717583)

1.75ct Natural Deep Violet Blue Tanzanite, Pear Shape, VS

Tanzanite

1.75ct1 pc
$ 517.55
5 x 5 mm (calibrated)
View Details
Add to Cart
66.10ct Natural White with Black Dendritic Agate, Pear Shape, Opaque, Photo A

66.10ct Natural White with Black Dendritic Agate, Pear Shape, Opaque

Dendritic Agate

66.10ct1 pc
$ 32.92
47.4 x 31.3 mm
View Details
Add to Cart
1.37ct Natural Deep Green Tourmaline, Octagon / Emerald Cut, VVS-VS, Photo A

1.37ct Natural Deep Green Tourmaline, Octagon / Emerald Cut, VVS-VS

Tourmaline

1.37ct1 pc
$ 33.02
17.3 x 3 mm
View Details
Add to Cart
0.47ct Natural Warm Forest Green Sapphire, Oval, VS, Photo A

0.47ct Natural Warm Forest Green Sapphire, Oval, VS

Sapphire

0.47ct1 pc
$ 34.74
4.9 x 3.9 mm
View Details
Add to Cart
0.75ct Natural Medium Green Tourmaline, Octagon / Emerald Cut, VS-SI, Photo A

0.75ct Natural Medium Green Tourmaline, Octagon / Emerald Cut, VS-SI

Tourmaline

0.75ct1 pc
$ 37.35
6.3 x 3.9 mm
View Details
Add to Cart
22.78ct Natural Multicolor Ammolite, Fancy, Opaque, Photo A

22.78ct Natural Multicolor Ammolite, Fancy, Opaque

Ammolite

22.78ct1 pc
$ 249.58
26.5 x 17.4 mm
View Details
Add to Cart
26.50ct Natural Pineapple Yellow Quartz, Cushion, VS, Photo A

26.50ct Natural Pineapple Yellow Quartz, Cushion, VS

Quartz

26.50ct1 pc
$ 58.07
19 x 19 mm (calibrated)
View Details
Add to Cart
3.66ct Natural Medium Gold Citrine, Square, VVS-VS, Photo A

3.66ct Natural Medium Gold Citrine, Square, VVS-VS

Citrine

3.66ct1 pc
$ 25.51
9 x 9 mm (calibrated)
View Details
Add to Cart
1.07ct Natural Lilac Sapphire, Cushion, VVS-VS, Photo A
Sapphire Product Video (461342)

1.07ct Natural Lilac Sapphire, Cushion, VVS-VS

Sapphire

1.07ct1 pc
$ 351.69
7 x 5 mm (calibrated)
View Details
Add to Cart
10.51ct Natural Earth Green Moldavite, Fancy, Translucent, Photo A
Moldavite Product Video (736126)

10.51ct Natural Earth Green Moldavite, Fancy, Translucent

Moldavite

10.51ct1 pc
$ 215.53
20 x 16.3 mm
View Details
Add to Cart
2.25ctw Natural Sky Blue Topaz, Oval, VVS-VS, Photo A

2.25ctw Natural Sky Blue Topaz, Oval, VVS-VS

Topaz

2.25ct total2 pcs
$ 12.38
7 x 5 mm (calibrated)
View Details
Add to Cart
0.93ctw Natural Light Lively Green Peridot, Pear Shape, VVS-VS, Photo A

0.93ctw Natural Light Lively Green Peridot, Pear Shape, VVS-VS

Peridot

0.93ct total2 pcs
$ 8.15
6.1 x 4.2 mm
View Details
Add to Cart

Why Buy Octagon Shape 27 X 20 Mm Gems from GemSelect?

GemSelect Certified Store Reviews

GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!

Overall Rating -> 10 star ratings

I was able to find what i needed once I worked out what I was looking for.

Posted By Dr Kenneth in August, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection. Maybe too great i kept adding and deleting stuff because i found better looking ones

Posted By Edsor works in October, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

If you have motion picture, then I will be more satisfied with.

Posted By Ray in November, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Easy to use. Many options to find the right gemstone

Posted By Liz in May, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.

Posted By RenoRose in January, 2026
Source: Bizrate

Overall Rating -> 10 star ratings

I was able to find what I've been looking for.

Posted By Tree Dog in April, 2026
Source: Bizrate
→ View All GemSelect Reviews on Bizrate
Enlarged Gemstone Image