WELCOME TO CALEB B. QUASHEN INTERNATIONAL

RARE LOOSE GEMSTONES, DIAMONDS & ONE-OF-A-KIND STONES FOR CUSTOM JEWELRY

New Arrivals

View all
1.21 carat opalescent violet purple pink rose cut sapphire shown face-up, displaying soft lavender and rose tones with oval rose cut faceting from Sakaraha, Madagascar.
1.21CT Sapphire: Opalescent Pink Lavender Precision Oval Rose Cut
$745.00
Close-up of a 3.36-carat precision-cut olive green sapphire resting near white flowers. The gem showcases an elongated emerald cut and glows with opalescent green hues.
3.36CT Sapphire: Vivid Green Opalescent Precision Elongated Emerald Cut
$4,485.00
Close-up view of a 1.43-carat no-heat sapphire in a custom trillion cut. The gemstone shines in deep teal and blue-green shades, emphasizing its unique geometric design. Captured on a mannequin's finger, the gem’s vivid color and clarity stand out.
1.43CT Sapphire: Teal Blue-Green Custom Geometric Trillion Cut
$1,122.50
2.52 carat mint green sapphire shown face-up, displaying bright green color and natural brilliance from Sakaraha, Madagascar.
2.52CT Sapphire: Mint Green Precision Elongated Emerald Cut
$2,850.00
View all
98 products
Natural rough sapphires in blue, green, teal, purple, and yellow tones, showcasing raw gemstone color before cutting.

ETHICALLY SOURCED
& ETHICALLY PRICED

LEARN MORE ABOUT WHAT MAKES US DIFFERENT
Natural rose cut diamonds in white, gray, champagne, yellow, and cognac tones arranged on wood for custom jewelry sourcing.

ONE OF A KIND /
OBSCURE DIAMONDS

FIND YOUR UNIQUE DIAMOND
Precision cut teal sapphire on a gem lens, showcasing blue-green color, brilliance, and one-of-a-kind character for custom jewelry.

BUYING TIPS & INDUSTRY
INSIGHTS

Learn how gemstones are sourced, treated, cut, and selected for custom jewelry.
view our new blog post on sapphire heat treating
Vivid green loose gemstone on natural wood beside a praying mantis, showcasing rare color, natural beauty, and one-of-a-kind character.
Rare Loose Gemstones

Shop the Collection

Explore sapphires, diamonds, tanzanite, and one-of-a-kind stones selected for color, origin, and character.
Shop Loose Gemstones
Ladybug perched on a vivid green loose gemstone on natural wood, showcasing bold color and one-of-a-kind gemstone character.
Custom Jewelry Starts Here

Choose the Stone First

Find a loose gemstone for a custom ring, pendant, engagement ring, or meaningful one-of-a-kind piece.
Custom Jewelry Guide
Bright green loose gemstone beside a striped caterpillar on natural wood, showcasing vivid color and one-of-a-kind gemstone character.
For Designers & Jewelers

Source With CBQ

Build a long-term gemstone sourcing relationship for client projects, trade access, and distinctive stones.
Designer Partnerships
Mountain landscape at sunrise symbolizing the global sourcing journey behind rare natural gemstones and one-of-a-kind stones.

HONESTLY AND ETHICALLY

SOURCED FROM ALL ENDS OF THE WORLD

Using the term 'ethical' when describing sourcing has become common place amongst the industry. We go further, ensuring ethics do not stop at our sourcing but also translate in to how we price our pieces for you, our clients. All while remaining dedicated to equitable relationships with the communities we work with around the world.

Explore the gem vault here

Ethically sourced natural diamonds — antique and geometric cuts with unique character — CBQ International.
All Loose Diamonds
Ethically sourced sapphire collection — Madagascar, Montana, Sri Lanka, Tanzania, Nigeria, Afghanistan, Kenya — Caleb B. Quashen International.
Loose Sapphires from All Origins
The Complete Loose Gemstone Collection
The Complete Loose Gemstone Collection
Unheated Tanzanite gemstone — teal, violet, and mermaid hues — ethically sourced from Merelani Hills.
Loose Tanzanite
Natural rose cut diamonds in champagne, cognac, yellow, and gray tones arranged on wood for custom jewelry sourcing.

BOLD CUTS

Specializing in custom and obscure

While we offer traditional cuts and material, we love to create one of a kind, customized cuts that allow the natural traits of stones to come to life. Sometimes a stone tells us what it wants to become — we simply listen.

Hand holding a compass over a world map, representing global gemstone sourcing and the search for rare natural loose gemstones.
Guidance in Collaboration

Custom Jewelry Clients and Designers Start With the Stone

Whether you are creating a custom piece or sourcing gemstones for client projects, CBQ helps connect the right stone with the right design. Explore our gemstone guide for custom jewelry clients or learn how designers can partner with us for long-term sourcing.
Custom Jewelry Gemstone Guide Designer Gemstone Partnerships