Gemstone Cabochon Sizing Guide

So let’s start with small sizes, 2mm–3mm. These sizes are small but impactful and are ideal for small jewelry. T

hey are commonly used in accent jewelry like nose pins, delicate studs, and accents in cluster rings. And, their compact size brings a high level of detail and sparkle in both faceted and cabochon cuts.

Popular Faceted Shapes and Sizes:

• Round - 2mm, 2.5mm, 3mm size (popular in green tourmaline, and Swiss blue topaz)
• Oval - 2*3mm, 2.5*3.5mm size ( Iolite, and Rhodonite garnet)
• Pear - 2*3mm, 2.5*4mm size (popular in Ethiopian opal and amethyst)
• Triangle/Trillion - 3mm size (Citrine, and Kyanite)
• Other Cuts - Princess (square), baguette, and marquise cut ( White Topaz, and Pink Sapphire)

Popular Cabochon Shapes and Sizes:

• Round - 2mm, 3mm size (Moonstone, Labradorite)
• Oval - 2*3mm, 2.5*3.5mm size (Tanzanite, Amazonite)
• Pear - 2*3mm, 2.5*4mm size (Apatite, Aquamarine)
• Triangle (Smooth Trillion) - 3mm size (Fire Opal, Ametrine)
• Other Forms - Micro Freeform, Domed Mini Cabs (Rainbow Moonstone, and Peridot)
  

They are perfect for wire-wrapped minimalist pendants, and beaded earrings. Besides their small size, they bring vibrant color and character in each gem. Oval and pear shapes offer more length with a small width, while round and triangle shapes give symmetry. These mini gems are perfect for precision-set artisan jewelry where detail matters. Also, popular shapes like 2*2mm round, 2*3mm oval, and 3*3mm triangle are trending in precision layouts.

2. 4mm to 5mm Gemstones cabochons & Faceted Cuts

This size range is highly popular in the jewelry world. 4mm to 5mm sizes gemstones are a sweet spot size for deep and eye-catching designs. In faceted cut, these sizes are commonly used in ear studs, striking rings, delicate pendants, stud earrings, and multi-stone bracelets.
Whether you’re looking for 4mm faceted gemstones, 5mm gemstone cabochons and 4mm cabochons for earrings, we offer trillion cut gemstones with all calibrated sizes. In cabochons, 4mm to 5mm stones are commonly used in chakra jewelry, small charms, beaded designs and spiritual tools.

Popular Faceted Shapes and Sizes:

• Round: 4mm, 5mm (used in Swiss Blue Topaz and Rhodolite Garnet stone)
• Oval: 4*5mm, 4.5*5.5mm (common in Aquamarine, Pink Tourmaline gem)
• Pear: 4*6mm (Amethyst, and Ethiopian Opal stone)
• Triangle/Trillion: 4mm, 5mm (e.g., Sky Blue Topaz, Kyanite)
• Other Cuts: Princess (Square), Marquise, Baguette (e.g., Peridot, Spinel)
  

High common Cabochon Shapes and Sizes:

• Round: 4mm, 5mm (e.g., Moonstone, and Labradorite stone)
• Oval: 5*7mm (e.g., Amazonite, Charoite stone)
• Pear: 4*6mm (e.g., Apatite, Fire Opal)
• Triangle: 4mm, 5mm Smooth Trillion (e.g., Sunstone, Amethyst)
• Other Forms: Puffy Square, Smooth Freeform, Domed Mini Cabs (e.g., Malachite, Seraphinite) 
• Cushion & Square – 5mm size

At cabochon4sale, you can explore high popular sizes like 4*3mm oval, 5*5mm round, 4*4mm square, and 5*3mm pear. These sizes maintain elegance while offering more surfaces for color and clarity to shine.  At cabochons4sale, we offer 4*5 oval cabochons, pear shaped semi-precious stones and square cut gemstones wholesale at reasonable prices.

6mm to 7mm Gemstones – Perfect balance of Elegance and Versatility

Now we talk about 6mm to 7mm sizes. If you’re crafting ring or a stunning pendant, 6mm to 7mm is a versatile size for all gemstones. This is not too small, not too large, and is ideal for everyday wear. Used for fine rings, bracelets, pendants, solitaire earrings, and medium-size earrings. Want more 7*5 cabochons for silver jewelry?

Here are the most popular and high-performing shapes, used by jewelers and searchable by collectors.

Popular Faceted Shapes & Sizes -

• Cushion Cut, Round Brilliant, Trillion (Triangle), and Square (Princess cut): 6mm, 7mm
• → Popular in Citrine, Green Amethyst, Tourmaline, Swiss Blue Topaz, Garnet, and Tanzanite gems
• Oval Cut: 6*8mm, 6*7mm
• → Top gems- Aquamarine, Tanzanite, Rhodolite
• Pear Cut, Emerald cut: 6*8mm, 6*9mm
• → Popular in Ethiopian Opal, Pink Tourmaline, Apatite, Peridot
• Marquise - 6*12mm, 7*14mm
• → Top stones: Peridot, Apatite, Chrome Diopside
  

Popular Cabochon Shapes & Sizes -

• Oval Dome, Pear: 6*8mm, 6*7mm
• → Top gems - Amazonite, Rhodochrosite, and Rainbow Moonstone
  
  
• Round Cabochon, Triangle (Smooth Trillion) - 6mm, 7mm
• → Top stones: Moonstone, Labradorite, and Malachite

These sizes are used in stud earrings, halo rings, 3-stone rings, Art deco rings, vertical pendants, Bezel-set rings, wire wraps, and boho-style rings.

Though, popular sizes 6*4mm oval, 7*5mm pears, 6mm round, 7mm triangle and 6mm-7mm gemstones cabochons for silver jewelry. These gems display enough brilliance in faceted cuts and depth in cabochons, and offer flexibility for creative settings.

4. 8mm to 9mm Gemstones cabs – Bold Size, and Maximum Versatility

Now we are entering bold statement territory.  8mm to9mm gems are popular choice for statement jewelry. Because, they offer enough surface area to showcase unique patterns, flashes and colors. These sizes are best for cocktail rings, dramatic earrings, and centerpiece pendants. These sizes are highly searchable by wire-wrappers, jewelers, and gemstones collectors.

Faceted cuts maximize brilliance and are popular in:

• Round brilliant: 8*9mm 
• Top gems - Amethyst, Citrine, Garnet, and White topaz
• Oval, Emerald cut: 8*6mm to 9*7mm 
• Top stones - Aquamarine, Morganite, Sapphire, Emerald 
• Pear: 8*5mm to 9*6mm 
• Top gems - Peridot, ruby, tourmaline
• Marquise: 8*4mm to 9*5mm 
• Common in Diamond, pink quartz, zircon
• Heart: 8mm or 9mm 
• Top gems - Morganite, amethyst, synthetic opal) 
• Step cuts (baguette, square emerald): Popular in Sapphire, jade, demantoid garnet
  

Popular Cabochons shapes and sizes:

• Large ovals - 8*6mm or 9*7mm 
• Common in Opal (with play-of-color), and star sapphire (asterism)
• Teardrop (pendant cut: 8*5mm or 9*6mm 
• Popular in Moonstone (blue sheen), chalcedony
• Round: 8mm
• Commonly used in Tiger eye, lapis lazuli and Aquamarine.
• Cushion cab, Triangle: 8mm or 9mm per side
• Used in Lapis lazuli, turquoise, labradorite and cabochon ruby
• Freeform: 8-9mm at widest point 
• Popular in Moss agate, dendritic quartz, and organic-shaped opals
  

Popular sizes are 8*6mm oval, 9*7mm pear, 9mm round, and 8mm triangle in jewelry making. At this size, both clarity and cut must be precise, especially for faceted stones.

In jewelry making, 8x6mm cabochon is a high popular size. Whether you’re looking for oval cab, we provide center stone gem, faceted 8x6mm, and medium gemstone for jewelry makers and collectors.

 5. 10mm to 11mm Gemstones -

If you want to create something unique, then choose 10mm to 11mm gemstones. A perfect size for bold jewelry lovers, as this is often seen in cocktail rings, large pendants, and brooches.
The best Faceted cuts (sparkle and fire):

• Round brilliant - 10-11mm
• Common in amethyst, citrine, garnet, and white sapphire
• Oval: 10*7mm to 11*8mm 
• Common in aquamarine, morganite, spinel gem
• Pear: 10*6mm to 11*7mm 
• mostly used in tourmaline, peridot, ruby stone
• Emerald cut - 10*8mm to 11*9mm 
• Perfect for emerald, sapphire, and diamond.
• Marquise - 10*5mm to 11*6mm 
• Commonly seen in zircon, topaz gems
• Heart Shape, Step Cuts (cushion, emerald) - 10mm and 11mm 
• Best for pink quartz, morganite gem, jade and synthetic opal 

Popular Cabochons (smooth, domed surfaces) shapes and sizes:

• Large ovals - 10*8mm to 11*9mm cabochon
• Common in opal (shimmering fire) and star sapphire
• Teardrop - 10*6mm to 11*7mm gems
• Popular in moonstone, chalcedony cabochon
• Cushion cab, Triangle - 10mm or 11mm per side
• Commonly seen in turquoise, lapis lazuli, labradorite and cabochon ruby
• Freeform: 10–11mm at widest
• This size is used in moss agate cabochon, dendritic quartz, and organic opals.
  

If you’re looking for 9x7mm gemstone, marquise cabochon, large oval stone, we offer rectangle gem, calibrated cab, pear shaped stone, for vintage pendant stone making.

6. 12mm to 13mm Gemstones – Bold and beautiful Size 

If you want extra bold for oversized styles. Then, you can choose 12mm to 13mm gemstones for creating stunning centerpiece in bold rings, pendants and fine earrings. At this size, even modest gem types looks impressive, and fine gems rival jewelry seen on red carpets. 

Popular Faceted cuts and shapes:

• Round brilliant cut - 12–13mm 
• Popular in Amethyst, Citrine, Garnet, and Morganite stone
• Oval - 12*8mm to 13*9mm 
• Ideal for Aquamarine, Sapphire, and Tourmaline gem
• Pear - 12*7mm to 13*8mm 
• Elegant in Peridot, Pink Topaz, and Ruby
• Emerald cut - 12*10mm to 13*11mm 
• Most used in emerald, diamond, spinel gem
• Marquise: 12*6mm to 13*7mm 
• Often seen in zircon or white sapphire
• Heart, Step cuts (cushion, baguette): 12mm and 13mm 
• A romantic choice in morganite gem, amethyst, sapphire and opal stone

Most Common Cabochons shapes (highlight optical effects):

• Large ovals - 12*10mm to 13*11mm 
• Top stones: Opal (fire), and star sapphire (asterism)
• Teardrop (pear) - 12*8mm to 13*9mm 
• Common in moonstone (blue fire), and chalcedony cabochon 
• Cushion cab, Triangle cuts - 12mm or 13mm per side
• Popular in turquoise, lapis lazuli, and cabochon ruby
• Freeform shapes: 12–13mm wide 
• Most used in moss agate, dendritic quartz, organic opals
• large domed rounds – 12mm
  

Popular sizes like 12*10mm oval, 13*11mm pear, 12mm round, and 13*9mm cushion are favorite choice among jewelry makers and collectors. These gemstones are often used for the focal point of a piece.

7. 14mm to 15mm Gemstones – Large Format gems for statement jewelry

Want to create large gems jewelry? Then, these size gemstones are large, luxurious and highly dramatic and perfect for show stopping jewelry like statement rings, bold pendants and high-end macramé. These sizes give designers more real estate for artistic settings.

Popular Faceted Cuts (for brilliance and fire):

• Round Brilliant cut: 14–15mm 
• Best used in amethyst, citrine, morganite, and synthetic spinel
  
  
• Oval - 14*10mm to 15*11mm 
• Perfect for aquamarine, tourmaline, and sapphire
  
  
• Pear - 14*9mm to 15*10mm 
• Common in Peridot, pink topaz, or garnet
  
  
• Emerald Cut - 14*12mm to 15*13mm 
• Best for emerald, spinel, Diamond
  
  
• Marquise: 14*7mm to 15*8mm 
• Often seen in zircon or white sapphire
  
  
• Heart, Step Cuts (like cushion, or asscher) - 14mm to 15mm
• Popular in morganite, amethyst, opal, jade, sapphire, and demantoid garnet stone
  

Popular Sizes and Shapes in cabochon:

• Large Ovals - 14*12mm to 15*13mm 
• Popular in opal, and star sapphire
• Teardrop - 14*10mm to 15*11mm 
• Common in moonstone (adularescence), and chalcedony
• Cushion Cab, Triangle - 14mm or 15mm 
• Popular in turquoise, lapis lazuli, and ruby cabs
• Freeform: 14–15mm wide 
• Used for moss agate, dendritic quartz, and organic opals

Whether you’re seeking 14*10mm oval, 15*12mm pear, 14mm round, and 15*11mm triangle sizes for jewelry making, we offer vibrant gems with calibrated sizes. These are valued in high-end or statement collections. Due to size, secure settings (like bezel or high prongs) are important. 

8. 16mm to 17mm Gemstones –Perfect Size for Show-Stopping Creations

16mm to 17mm are premium sizes for creative expressions. And an ideal choice for bold jewelry pieces like pendants, statement rings and brooches.

Popular Cuts & Sizes in Faceted Gems -

• Oval (Big Ovals) - 16*12mm, 17*13mm
• → Top stones: Tanzanite, Ametrine, And Apatite
• Fantasy Pear: 16*10mm, 17*11mm
• → Top stones: Fire Opal, Pink Tourmaline, Citrine
• Heart Cut: 17mm, 16mm
• → Top stones: Rose Quartz, Swiss Blue Topaz, Rhodolite Garnet
• Kite Cut: 16*12mm, 17*14mm
• → Top stones - Green Amethyst, Lemon Quartz, Kyanite

Top Selling Cuts & Sizes in Cabochons:

• Oval Domes (High-Domed) - 16*12mm, 17*13mm, 17*14mm
• → Top gems - Rainbow Moonstone, Amazonite, and Labradorite
• Dramatic Pear (Smooth) - 16*10mm, 17*11mm
• → Top stones - Chrysoprase, Lepidolite, and Fire Quartz
• Large Triangle (Smooth Trillion) - 16mm, to 17mm cabochon
• → Top stones: Aventurine, Amethyst, and Garden Quartz
• Organic Freeform - Variable irregular shapes
• → Top stones - Moss Agate, Lodolite, and Crazy Lace Agate
  

They’re perfect for those customers who are seeking bold looks, collectors wanting rare shapes, or jewelry brands needing limited-edition centerpieces.

Looking to buy 16*12mm oval, 17*14mm pear, 16mm round, and 17*13mm cushion cut gems? Explore our full collection of natural gemstones cabochons with various shapes and sizes at the best prices. And, buy cushion cabochon, triangle gemstone and alter jewelry stone for unique jewelry making. Create a bold impression with this statement pendant gem centerpiece.

9. 18mm to 19mm Gemstones – Extra-Large Gems for Dramatic Designs

For one-of-a-kind designs, use these sizes and create unique and bold jewelry pieces.. These are rare sizes, often used in gemstone carvings, cuffs, or sculptural pieces.

Popular Faceted Cuts, Shapes and Sizes:

• Oval Cut: 18*13mm, and 19*14mm
• → Top stones:-Ametrine, Kyanite, Aquamarine
• Shield Cut: 18*12mm, 19*13mm
• → Top stones: - Labradorite, Moonstone, Rutile Quartz
• Heart Cut, Cushion cut - 18mm, and 19mm
• → Top stones: - Rose Quartz, Swiss Blue Topaz, Amethyst, Tanzanite and Ametrine
• Kite Cut: 18*13mm, and 19*15mm
• → Top stones - Lemon Quartz, Green Amethyst, Labradorite
• Emerald Cut: 18*13mm, 19*14mm
• → Top stones - Aquamarine, Green Amethyst, Golden Rutile Quartz
• Bullet Cut: 18*9mm, 19*10mm
• → Top stones - Garnet, Amethyst, and Black Tourmaline
• Rose Cut (Round & Oval): 18mm Round, 19*14mm Oval
• → Top stones - Kunzite, Aquamarine, Green Onyx
  

High-demand cuts and sizes in cabochons:

• Oval (Large Ovals): 18*13mm, 19*14mm
• → Top stones - Labradorite, Moonstone, Malachite
• Large Round Cabochons: 18mm, 19mm
• → Top stones - Lapis Lazuli, Malachite, Ammonite
• Exaggerated Pear Cabochons: 19*12mm, 18*11mm
• → Top stones - Amazonite, Labradorite, and Turquoise
• Triangle Cabochons: 18mm, 19mm
• → Top stones - Fluorite, Carnelian, and Rhodochrosite
• Freeform Artistic Cabochons: Approx. 18–19mm in width/length
• → Top stones - Ocean Jasper, Pietersite, and Banded Agate
  

Not all, but some most popular sizes are 18*13mm oval, 19*15mm pear, 18mm round, 19*12 triangle. These are often sold as centerpieces for luxury and custom work.

Whether you’re looking for 13x10mm gemstone, large oval cabochon, freeform cab, and triangle stone, we offer a wide range of top-quality gems with secure and worldwide shipping. Mostly designers used artisan pendant gem and bold teardrop cabochons for attractive jewelry.

10. 20mm Gemstones cabochons – Oversized Beauty for Bold Statements 

Now let’s talk about 20mm gemstones. Rather than all, this size is highly useful and valued for exclusive designer work, healing crystals, wire wraps, and large jewelry sets. Looking for 20mm gemstone cabochons? They are prized for their smooth, bold look in jewelry. 

Faceted Gemstones (20mm Range)

• Oval fantasy cut – 20*15 mm 
• - Popular in Amethyst, citrine, Swiss Blue, Topaz
  
  
• Round oversized – 20 mm 
• - Popular in Rose Quartz, kunzite, Prasiolite and Golden rutile quartz
  
  
• Cushion Cut – 22*16 mm 
• - Popular in Ametrine, Aquamrine and Garnet
  
  
• Large pear or emerald cuts – 25*18 mm
  
  
• Fantasy faceted stones - 20*18mm 
• - Popular in Moissanite, Zircon, and Meteor Shower Sunstone.
  
  
• Fancy cushion and hexagon cuts – 24*20 mm

For Cabochon Gemstones (20mm Range) -

• Oval – 20*15 mm - Commonly used in Labradorite, Moonstone, Turquoise cabochon, Malachite, and Chrysoprase stone. 
• Round domed – 20mm - Highly common in Lapis Lazuli, Tiger Eye stone, and Ocean Jasper.
• Triangular or oval cuts – 20*16 mm - Common in Azurite, Charoite, Pietersite and Green Aventurine.
• Freeform slabs and polished drops – 20 mm - Available in Opal Doublets, Ammolite, Amber, Tabasco Geode, and Garden Quartz (Lodolite).
• Large statement ovals and rounds – 24*20 mm 

Explore our popular sizes like 20*15mm oval, 20mm round, 20*14mm pear, and 20*18mm triangle, which are popular choice for jewelry makers and collectors. Not all, but some gems at this scale can display unique inclusions, colors, or patterns. This makes them perfect for artisan designs.
These sizes are mostly used in wire wrapping or bezel settings, chunky rings, boho designs, pendants, and tribal.

 Round Sizes (2mm–12mm) – For Every Style and Setting

Round gemstone cabochons from 2mm to 12mm are classics. They’re used in everything from tiny inlays and mosaic jewelry to large round statement pendants. Rather than, smaller sizes like 2mm to 4mm sizes are perfect for studs and tiny bezels. And, mid-range (6mm to 8mm) works great for rings and stacking pieces. 10mm and 12mm round gems offer serious effect. Also, round cuts are especially loved for symmetry, simplicity, and their easy fit into standard settings. 

Where to Buy Calibrated Cabochons?

Looking to buy wholesale gemstones cabs and stones near me? You can buy wholesale and custom-calibrated gemstone cabochons directly from cabochons4sale. Want to buy matched sets, rare shapes, or creative cuts? We deliver quality cut gems with affordability all over the world.

Final Thoughts - Select the Right Size, Shape & Cut

Working on a creating minimalist ring design? Our 5×3 mm cabochons are perfect for this. And, design bold pendants using 14×10 mm freeform stones. Knowing gemstone sizes helps you to bring your design vision to life with confidence. No matter if a gemstone has faceted rounds to triangle cabochons, every size offers a unique purpose in jewelry making, crystal healing, and collecting world.

Looking for something elegant to fit ready-made settings? Explore our calibrated sizes like 6×4 mm, 8×6 mm, and 10×8 mm that are perfect for your designs, available in each gemstones. While unusual cuts like trillion, marquise, and abstract freeforms add a touch of elegance and uniqueness to your pieces. So you can shop with confidence and create endlessly.
At cabochons4sale, we specialize in offering wholesale calibrated gemstones in a variety of sizes, shapes, and materials. You can explore from moonstone and turquoise to fire opal and garden quartz. 

Explore our all sizes and shapes -

Round, Cushion, Trillion (Triangle), Square, Heart, Pentagon, Hexagon, Octagon, Star, Shield, and Freeform  calibrated - 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 16mm, 17mm, 18mm, 19mm, 20mm 

Oval, Pear, Rectangle , Marquise, Kite, Heart, Emerald , Coffin cut– 3x2mm, 4x3mm, 5x3mm, 6x4mm, 7x5mm, 8x6mm, 9x7mm, 10x8mm, 11x9mm, 12x10mm, 13x9mm, 13*11mm, 14x10mm, 14x12mm,  15*13mm, 16x12mm, 17*14mm, 18*13mm, 19*17mm, 20*15mm, 20*17mm