search
  • Sign In
    Sign Up
  • English speaking customer support only

    Toll Free - USA & Canada only:
    1-800-464-1640

    International:
    +66-39303404

  • Change Language
  • USD

Buy Round Shape 13 mm Gems

(340)
Gem Type Weight Size Clarity Price Origin
More
Single
Pairs
Lots
Faceted
Cabochons
Sort By:
Clear All
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Warm White Cat's Eye Moonstone Gem - 9.8ct Round Cabochon (ID: 481763)

Round White Cat's Eye Moonstone

9.8ct
13.3 mm
$ 39.00
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Light Pink Rose Quartz Gem - 9.3ct Round Petal Cut (ID: 414437)

Round Pink Rose Quartz

9.3ct
13.5 mm
$ 46.60
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Hickory Brown Smoky Quartz Gem - 8.7ct Round Petal Cut (ID: 401212)

Round Brown Smoky Quartz

8.7ct
12.9 mm
$ 21.62
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Gingerbread Brown Smoky Quartz Gem - 6ct Round Facet (ID: 466187)

Round Brown Smoky Quartz

6ct
12.6 mm
$ 9.06
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Medium Violet Pink Amethyst Gem - 7.6ct Round Facet (ID: 459570)

Round Violet Amethyst

7.6ct
12.9 mm
$ 45.84
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Reddish Brown Smoky Quartz Gem - 7ct Diamond-Cut (ID: 408100)

Round Brown Smoky Quartz

7ct
12.6 mm
$ 12.51
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Light Coffee Brown Star Moonstone Gem - 11.3ct Round Cabochon (ID: 418948)

Round Brown Star Moonstone

11.3ct
13 mm
$ 45.36
Item in Stock
Click for Details
Compare
2 pcs
Add to Cart
Buy Now
Pale Pine Green Jadeite Gem - 8ct Round Cabochon (ID: 549034)

Round Green Jadeite

7.99 ct (total 15.97ctw)
12.8 mm
$ 47.91
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Medium Gold Rutile Quartz Gem - 7.8ct Round Cabochon (ID: 435496)

Round Golden Rutile Quartz

7.8ct
13 mm
$ 19.32
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Pale Forest Green Jadeite Gem - 7.6ct Round Cabochon (ID: 470714)

Round Green Jadeite

7.6ct
12.5 mm
$ 22.86
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Medium Green Maw-Sit-Sit Gem - 9.6ct Round Cabochon (ID: 406937)

Round Green Maw-Sit-Sit

9.6ct
13.1 mm
$ 27.18
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Very Light Golden-Brown Rutile Quartz Gem - 10.2ct Round Cabochon (ID: 403467)

Round Golden Rutile Quartz

10.2ct
12.9 mm
$ 32.30
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Medium Brown Smoky Quartz Gem - 5.7ct Diamond-Cut (ID: 513231)

Round Brown Smoky Quartz

5.7ct
12.6 mm
$ 17.01
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Dark Brown Smoky Quartz Gem - 9.5ct Round Petal Cut (ID: 401339)

Round Brown Smoky Quartz

9.5ct
12.8 mm
$ 23.75
Item in Stock
Click for Details
Compare
6 pcs
Add to Cart
Buy Now
Click for Product Video (422987)
Multicolor White Howlite Gem - 15.3ct Drilled Sphere (ID: 422987)

Sphere / Ball White Howlite

15.27 ct (total 91.64ctw)
12.6 mm
$ 73.31
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Tuscany Yellow Citrine Gem - 6.8ct Round Facet (ID: 504930)

Round Yellow Citrine

6.8ct
13 mm
$ 34.15
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Medium Gold Citrine Gem - 8ct Round Facet (ID: 505033)

Round Golden Citrine

8ct
13 mm
$ 40.10
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Medium Green Maw-Sit-Sit Gem - 9.3ct Round Cabochon (ID: 477056)

Round Green Maw-Sit-Sit

9.3ct
12.7 mm
$ 27.90
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Medium Violet Amethyst Gem - 7.8ct Round Facet (ID: 462332)

Round Violet Amethyst

7.8ct
12.9 mm
$ 46.62
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Very Light Golden-Brown Rutile Quartz Gem - 10.5ct Round Cabochon (ID: 403588)

Round Golden Rutile Quartz

10.5ct
13.3 mm
$ 33.13
Item in Stock
Click for Details
Compare
1 pc
Add to Cart
Buy Now
Click for Product Video (498583)
Brick Red Malaya Garnet Gem - 9.6ct Round Facet (ID: 498583)

Round Pink Malaya Garnet

9.6ct
12.5 mm
$ 383.60
Item in Stock
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Round Shape 13 mm Gems

Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated Round shapes, facet cut and cabochon gems available now in 13 mm diameter size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often around 0.3 mm or slightly higher even. This small variance can usually be accommodated for standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

Certified Customer Reviews
Overall Rating -> 10 star ratings
First, I wanted to say that you guys have a great selection gems, in all price ranges! Awesome site!! My son found a 6 piece set of blue topaz hearts that he wanted to get. I wanted to view all of the 6 piece sets or 10 piece sets. I recommend adding that ability to your filter.
Posted By Mike in February, 2020
Source: Bizrate
Overall Rating -> 10 star ratings
Everything came in as expected. This was a great experience and I will order from here again.
Posted By Sam in February, 2020
Source: Bizrate
Overall Rating -> 10 star ratings
It was great! They have a great selection of products for great prices. I found even more than I could've possibly wanted.
Posted By AveryN in February, 2020
Source: Bizrate
Overall Rating -> 10 star ratings
I have been ordering from GemSelect for almost a decade and every single item I have ever ordered arrived in perfect condition - and each of them was exactly as advertised! I have told my friends and encouraged them to shop there also. It is a pleasure to shop this site!
Posted By Jim in February, 2020
Source: Bizrate
Overall Rating -> 10 star ratings
This website is extremely easy to navigate and understand and not bogged down by unnecessary flourishes and programming. Best part is the real pictures of each gem. I love it
Posted By R dawg in February, 2020
Source: Bizrate
Overall Rating -> 8 star ratings
GemSelect is a really great vendor, the site is a little dated but it is very easy to navigate and find exactly what you're looking for! Their prices are very competitive and they have a great selection. Looking forward to receiving my pieces!
Posted By Jair in February, 2020
Source: Bizrate
Sign up for our Newsletter
More Shapes
  • Asscher Cut
  • Baguette / Scissor Cut
  • Baguette Cabochon
  • Baguette Checkerboard
  • Baguette Crystal Cluster
  • Baguette Facet
  • Baguette Rose-Cut
  • Baguette Step Cut
  • Baguette Sugarloaf Cabochon
  • Baroque
  • Barrel
  • Barrel / Checkerboard
  • Barrel / Full-Round
  • Barrel / Scissor Cut
  • Barrel Cabochon
  • Barrel Rose Cut
  • Bear Carving with Hole
  • Bird Carving
  • Briolette
  • Briolette with Hole
  • Carved Baguette
  • Carved Cameo
  • Carved Cushion
  • Carved Elephant
  • Carved Fancy
  • Carved Fish
  • Carved Fish with Hole
  • Carved Flower
  • Carved Fruit
  • Carved Half Heart
  • Carved Half Moon
  • Carved Heart
  • Carved Heart Cabochon
  • Carved Leaf
  • Carved Marquise
  • Carved Marquise Cabochon
  • Carved Octagon
  • Carved Oval
  • Carved Oval Cabochon
  • Carved Owl
  • Carved Pear
  • Carved Pear Cabochon
  • Carved Rhomb
  • Carved Rose
  • Carved Rose with Half Drilled Hole
  • Carved Round
  • Carved Round Bar
  • Carved Round Cabochon
  • Carved Sheep
  • Carved Shell
  • Carved Square
  • Carved Teardrop
  • Carved Trillion
  • Carved Turtle
  • Cushion Buff-Top
  • Cushion Cabochon
  • Cushion Carved Medusa Cameo
  • Cushion Checkerboard
  • Cushion Checkerboard (double sided)
  • Cushion Concave Fantasy Cut
  • Cushion Crystal Cluster
  • Cushion Mixed Cut
  • Cushion Rose-Cut
  • Cushion Shape Sugarloaf Cabochon
  • Cushion Sugarloaf Cabochon
  • Cushion-Cut
  • Diamond-Cut
  • Drilled Faceted Sphere
  • Drilled Sphere
  • Drilled Square Rondelle Slice
  • Fancy Cabochon
  • Fancy Carved Cushion
  • Fancy Carved Oval
  • Fancy Carved Pear
  • Fancy Carved Round
  • Fancy Carved Trillion
  • Fancy Carving
  • Fancy Crystal Cluster
  • Fancy Facet
  • Fancy Fantasy Carved Leaf
  • Fancy Fantasy Carving
  • Fancy Slice
  • Fancy Star Facet
  • Fancy-Cut
  • Fantasy Carved Flower
  • Fantasy Carved Flower Cut
  • Fantasy Carved Leaf
  • Flower Carving
  • Flower-Cut
  • Half Heart Cabochon
  • Half Heart Facet
  • Half Moon Cabochon
  • Half Moon Facet-Cut
  • Half Moon Faceted
  • Half-Drilled Briolette
  • Half-Drilled Sphere
  • Heart Cabochon
  • Heart Checkerboard (double sided)
  • Heart Facet
  • Heart Rose-Cut
  • Hexagon Cut
  • Marquise Buff-Top
  • Marquise Cabochon
  • Marquise Checkerboard
  • Marquise Checkerboard (double sided)
  • Marquise Facet
  • Marquise Mixed Cut
  • Marquise Slice
  • Marquise Sugarloaf Cabochon
  • Octagon / Scissor Cut
  • Octagon Cabochon
  • Octagon Checkerboard
  • Octagon Facet
  • Octagon Step Cut
  • Oval Buff-Top
  • Oval Cabochon
  • Oval Cabochon with Hole
  • Oval Carved Cameo
  • Oval Checkerboard
  • Oval Checkerboard (double sided)
  • Oval Concave Cut
  • Oval Crystal Cluster
  • Oval Diamond-Cut
  • Oval Facet
  • Oval Fancy Facet
  • Oval Fantasy Concave Cut
  • Oval Mixed Cut
  • Oval Portuguese-Cut
  • Oval Rose-Cut
  • Oval Slice
  • Pear Cabochon
  • Pear Checkerboard
  • Pear Checkerboard with Hole
  • Pear Concave Cut
  • Pear Concave Fantasy Cut
  • Pear Crystal Cluster
  • Pear Double-Sided Checkerboard
  • Pear Facet
  • Pear Shape Sugarloaf Cabochon
  • Pear Slice
  • Pencil
  • Pencil Cut
  • Princess-Cut
  • Rhomb Cabochon
  • Rhomb Checkerboard
  • Rhomb Checkerboard (Double-Sided)
  • Rhomb Facet
  • Rondelle
  • Round Buff-Top
  • Round Cabochon
  • Round Checkerboard
  • Round Checkerboard (double sided)
  • Round Concave Cut
  • Round Concave Fantasy Cut
  • Round Drilled Checkerboard (Double Sided)
  • Round Drilled Rondelle
  • Round Facet
  • Round Mixed-Cut
  • Round Petal Cut
  • Round Portuguese-Cut
  • Round Rose-Cut
  • Round Rose-Cut (double sided)
  • Round Slice
  • Shark Fin Cabochon
  • Shield Cabochon
  • Spherical
  • Square / Scissor Cut
  • Square Cabochon
  • Square Facet
  • Square Rose-Cut
  • Square Step-Cut
  • Square Sugarloaf Cabochon
  • Square with Hole
  • Tapered Baguette
  • Tapered Baguette Cabochon
  • Teardrop Cabochon
  • Trapezoid
  • Trapezoid Cabochon
  • Trapezoid Checkerboard
  • Triangle
  • Triangle Cabochon
  • Trillion Cabochon
  • Trillion Checkerboard
  • Trillion Concave Cut
  • Trillion Concave Fantasy Cut
  • Trillion Crystal Cluster
  • Trillion Facet
  • Trillion Rose-Cut
  • Trillion Shape Sugarloaf Cabochon
  • Undrilled Briolette Teardrop
Popular Gemstones
  • Sapphire
  • Emerald
  • Ruby
  • Aquamarine
  • Zircon
  • Opal
  • Topaz
  • Tourmaline
  • Garnet
  • Amethyst
  • Citrine
  • Tanzanite
All Gemstones (144)
A B C D E F G H I J K L M N O P Q R S T V Z
  • Actinolite Cat's Eye
  • Agate
  • Agate Geode
  • Almandine Garnet
  • Amazonite
  • Amethyst
  • Ametrine
  • Ammolite
  • Andalusite
  • Andesine Labradorite
  • Apatite
  • Aquamarine
  • Aventurine
  • Beryl
  • Black Opal
  • Bloodstone
  • Boulder Opal
  • Calcite
  • Carnelian
  • Cat's Eye Apatite
  • Cat's Eye Aquamarine
  • Cat's Eye Augite
  • Cat's Eye Gemstones
  • Cat's Eye Moonstone
  • Cat's Eye Opal
  • Cat's Eye Scapolite
  • Chalcedony
  • Charoite
  • Chocolate Opal
  • Chrome Diopside
  • Chrome Tourmaline
  • Chrysoberyl
  • Chrysocolla
  • Chrysoprase
  • Citrine
  • Clinohumite
  • Color-Change Diaspore
  • Color-Change Fluorite
  • Color-Change Garnet
  • Color-Change Sapphire
  • Coral
  • Demantoid Garnet
  • Dendritic Agate
  • Diamond
  • Druzy Amethyst
  • Druzy Azurite
  • Emerald
  • Enstatite
  • Fire Agate
  • Fire Opal
  • Fluorite
  • Fossil Coral
  • Garnet
  • Golden Beryl
  • Grandidierite
  • Grossularite Garnet
  • Hawk's Eye
  • Hematite
  • Hemimorphite Druzy
  • Hessonite Garnet
  • Hiddenite
  • Howlite
  • Idocrase
  • Imperial Topaz
  • Iolite
  • Jade Gemstones
  • Jadeite
  • Jasper
  • Kornerupine
  • Kunzite
  • Kyanite
  • Labradorite
  • Lapis Lazuli
  • Larimar
  • Malachite
  • Malaya Garnet
  • Mali Garnet
  • Maw-Sit-Sit
  • Moonstone
  • Morganite
  • Moss Opal
  • Mother of Pearl
  • Mystic Quartz
  • Mystic Topaz
  • Nuummite
  • Obsidian
  • Opal
  • Opal Doublet
  • Opal in Matrix
  • Pearl
  • Peridot
  • Pietersite
  • Prehnite
  • Pyrite
  • Pyrope Garnet
  • Quartz
  • Quartz Cat's Eye
  • Quartz With Marcasite
  • Rainbow Moonstone
  • Rainbow Pyrite
  • Rhodochrosite
  • Rhodolite Garnet
  • Rose Quartz
  • Rubellite Tourmaline
  • Ruby
  • Ruby in Fuchsite
  • Ruby-Zoisite
  • Rutile Quartz
  • Sapphire
  • Scolecite
  • Seraphinite
  • Serpentine
  • Sillimanite
  • Sillimanite Cat's Eye
  • Smithsonite
  • Smoky Quartz
  • Snowflake Obsidian
  • Sodalite
  • Spectrolite
  • Spessartite Garnet
  • Sphalerite
  • Sphene
  • Spinel
  • Star Diopside
  • Star Garnet
  • Star Gemstones
  • Star Lemon Quartz
  • Star Moonstone
  • Star Rose Quartz
  • Star Ruby
  • Star Sapphire
  • Star Sunstone
  • Strawberry Quartz
  • Sugilite
  • Sunstone
  • Tanzanite
  • Tiger's Eye
  • Tiger's Eye Matrix
  • Topaz
  • Tourmaline
  • Tsavorite Garnet
  • Turquoise
  • Variscite
  • Zircon
Main Categories
  • New Arrivals
  • Gemstone Lots
  • Calibrated Gemstones
  • Gemstones By Piece
  • Top Grade Gems
  • Matching Pairs
  • Cabochon Gemstones
  • Drilled Gems, Briolettes and Beads
  • Birthstones
  • Gemstone Carvings
  • Fancy Gemstones
  • Star Gemstones
  • Unheated Sapphire
English speaking customer support only

Toll Free - USA & Canada only:
1-800-464-1640

International:
+66-39303404

Save Money
No shipping Fees for Additional Items!
$8.90 Worldwide Shipping

Update Translation
 
Current Value
New Value
GemSelect Gemstones
X Close Window
Colored Gemstones
X Close Window
Colored Gemstones
X Close Window
Colored Gemstones
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