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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (162): Octagon Shape 6x4 mm Gems Clear All
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4 pcs
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0.6ct Octagon Step Cut Yellowish Green Tourmaline Gem (ID: 500407)
0.59 ct (total 2.35ctw) Tourmaline
6 x 4 mm
$ 106.93
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4 pcs
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0.5ct Octagon Step Cut Lively Green Peridot Gem (ID: 475132)
0.50 ct (total 1.98ctw) Peridot
5.9 x 4 mm
$ 49.50
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2 pcs
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0.6ct Octagon Facet Yellow Sapphire Gem (ID: 444881)
0.62 ct (total 1.23ctw) Sapphire
6.1 x 4 mm
$ 148.29
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2 pcs
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0.6ct Octagon Facet Yellow Sapphire Gem (ID: 444884)
0.59 ct (total 1.18ctw) Sapphire
6 x 4 mm
$ 142.26
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6 pcs
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0.5ct Octagon Facet Violet Blue Iolite Gem (ID: 279637)
0.51 ct (total 3.08ctw) Iolite
6 x 4 mm
$ 36.96
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6 pcs
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0.5ct Octagon Step Cut Violet Blue Iolite Gem (ID: 279642)
0.51 ct (total 3.04ctw) Iolite
6 x 4 mm
$ 36.48
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4 pcs
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0.6ct Octagon / Scissor Cut Red Pyrope Garnet Gem (ID: 480751)
0.63 ct (total 2.53ctw) Pyrope Garnet
5.9 x 3.9 mm
$ 17.71
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1 pc
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0.5ct Octagon Step Cut Light Blue Aquamarine Gem (ID: 497655)
0.52 ct Aquamarine
6 x 4.2 mm
$ 10.87
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6 pcs
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0.5ct Octagon Step Cut Violet Blue Iolite Gem (ID: 279647)
0.48 ct (total 2.88ctw) Iolite
6 x 3.9 mm
$ 34.56
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6 pcs
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0.5ct Octagon Facet Violet Blue Iolite Gem (ID: 279633)
0.45 ct (total 2.70ctw) Iolite
6 x 3.9 mm
$ 32.40
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4 pcs
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0.6ct Octagon / Scissor Cut Red Pyrope Garnet Gem (ID: 480828)
0.61 ct (total 2.42ctw) Pyrope Garnet
6 x 4.1 mm
$ 16.94
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6 pcs
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0.5ct Octagon Step Cut Violet Blue Iolite Gem (ID: 279571)
0.45 ct (total 2.68ctw) Iolite
5.9 x 3.9 mm
$ 32.16
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1 pc
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0.5ct Octagon Step Cut Brownish Green Kornerupine Gem (ID: 497922)
0.54 ct Kornerupine
5.9 x 4 mm
$ 11.34
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5 pcs
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0.5ct Octagon Step Cut Violet Blue Iolite Gem (ID: 279569)
0.52 ct (total 2.58ctw) Iolite
6.1 x 3.9 mm
$ 30.96
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6 pcs
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0.6ct Octagon Step Cut Red Pyrope Garnet Gem (ID: 480943)
0.57 ct (total 3.41ctw) Pyrope Garnet
6 x 3.9 mm
$ 23.87
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6 pcs
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0.5ct Octagon Step Cut Violet Blue Iolite Gem (ID: 279630)
0.52 ct (total 3.11ctw) Iolite
5.9 x 4 mm
$ 37.32
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1 pc
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0.6ct Octagon Facet Green to Pink Color-Change Diaspore Gem (ID: 422741)
0.63 ct Color-Change Diaspore
6.1 x 3.9 mm
$ 18.30
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5 pcs
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0.4ct Octagon Step Cut Violet Blue Iolite Gem (ID: 279565)
0.41 ct (total 2.06ctw) Iolite
5.9 x 4 mm
$ 24.72
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1 pc
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0.6ct Octagon Step Cut Brownish Green Kornerupine Gem (ID: 497915)
0.59 ct Kornerupine
5.8 x 3.9 mm
$ 12.39
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4 pcs
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0.5ct Octagon Step Cut Violet Blue Iolite Gem (ID: 476308)
0.49 ct (total 1.94ctw) Iolite
6 x 4 mm
$ 22.60
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5 pcs
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0.6ct Octagon Step Cut Violet Blue Iolite Gem (ID: 279579)
0.55 ct (total 2.77ctw) Iolite
6 x 4 mm
$ 33.24
Item in Stock
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Octagon Shape 6x4 mm Gems

GemSelect’s octagon (Emerald) shape 6x4mm gems are the ideal size for earrings, bracelets, and rings. Our calibrated gems are the perfect solution for new designs and repairs to existing pieces. The specifications of our stones ensure our stones to be within 0.24mm of the specified size making it easy to replace lost or damaged stones for cherished pieces. Our octagon-shaped gemstones are available in single units, pairs, lots, and multi-colored lots to assist you in selection.

A pair of earrings or a ring including GemSlect's 6x4mm octagon shaped gemstones can make an excellent anniversary gift for a cherished partner. We find the octagon or emerald cut to be ideal for a ring or earrings featured gem as it embodies the traditional design for a stone. The style of this gem gives the jewelry a classic feel that's always fashionable to wear. Our 6x4mm octagon stones arrange well when placed horizontally into a bracelet. Though they are seen most commonly in symmetrical arrangements, they can also appear in asymmetrical designs if set correctly.

6x4mm octagon-cut precious and semi-precious gemstones are available through GemSelect at wholesale prices. For additional information about each gemstone click the specific stone or stones of your choice. In this section, you will find detail including the weight of the gem, color, origin, treatment, cut, and all other applicable information.

Certified Customer Reviews
Overall Rating -> 9 star ratings
My selection was made quickly and efficiently.
Posted By JimC in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
GemSelect has a great selection at reasonable prices. Gemstones are always as beautiful as pictured.
Posted By GemLover in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Colors and qualities of gems are very well represented online. Easy to use website. Great selections!
Posted By in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
This was my second purchase from GemSelect and definitely won’t be my last! They have a very wide variety of gems and you can always find what you are looking for with ease and the prices are very good.
Posted By Jill in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Loved the wide selection of product
Posted By Miki in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
finally bought the last rock to complete my ring idea; needed another white one after giving the big diamond to my daughter. a diamond that size is out of my retired-school-teacher budget, so i bought a white zircon. went back to the same place that i got my loose sapphire-- great selection, good prices, good delivery!
Posted By Ptcmom in November, 2018
Source: Bizrate
Popular Gemstones
All Gemstones (144)
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart