Hand holding a tray of colorful loose gemstones in mixed cuts and colors, selected for custom jewelry, client projects, and designer sourcing. Hand holding a tray of colorful loose gemstones in mixed cuts and colors, selected for custom jewelry, client projects, and designer sourcing.
Long-term gemstone sourcing for designers, jewelers, and custom studios

Loose Gemstones for Jewelry Designers

Partner with Caleb B. Quashen to source rare sapphires, diamonds, tanzanite, and one-of-a-kind gemstones for client projects, custom designs, and meaningful jewelry.
Register for Trade Access Shop Loose Gemstones

A Gemstone Source for Jewelry Designers and Custom Jewelers

Jewelry designers need more than ordinary inventory. You need a gemstone source that understands client projects, custom design, timing, quality, and trust.

Caleb B. Quashen International partners with jewelry designers, custom jewelers, and industry clients who are sourcing loose gemstones for engagement rings, custom rings, pendants, heirloom pieces, and one-of-a-kind jewelry. Our goal is to build long-lasting relationships with designers by becoming a reliable gemstone source for stones with color, character, clear specifications, and story.

Whether you are purchasing directly, sourcing for a client, or sending a client to us to choose a center stone, we want to support the design process and help you create pieces that feel personal, intentional, and memorable.

Verified designer and trade accounts

Trade Accounts Unlock Designer Pricing

Jewelry designers, custom jewelers, and qualified industry clients can register for trade access through our jeweler registration page. Once your account is reviewed and approved, eligible accounts can unlock trade pricing on available stones.

Our verification process helps us protect trade access, support legitimate industry professionals, and build trusted long-term partnerships with designers who source loose gemstones for client projects.

Register for Trade Access
Hand holding blue, teal, gray, and rose cut loose gemstones selected for custom jewelry, client projects, and designer sourcing.
Trays of small loose sapphires in blue, teal, green, and pastel tones selected for custom jewelry accent stones and designer sourcing.

Source Gemstones by Type

Ethically sourced sapphire collection — Madagascar, Montana, Sri Lanka, Tanzania, Nigeria, Afghanistan, Kenya — Caleb B. Quashen International.
Loose Sapphires
Ethically sourced natural diamonds — antique and geometric cuts with unique character — CBQ International.
Loose Diamonds
Unheated Tanzanite gemstone — teal, violet, and mermaid hues — ethically sourced from Merelani Hills.
Loose Tanzanite
The Complete Loose Gemstone Collection
All Loose Gemstones

Built for Long-Term Designer Partnerships

Clear Specifications

Each listing includes important details such as gemstone type, weight, dimensions, shape and cut, origin when known, and treatment information.

Distinct Origins

Our inventory includes gemstones from respected sources including Sri Lanka, Madagascar, Montana, Nigeria, Tanzania, and beyond.

Client Project Support

Need help comparing stones for a client? We can assist with options based on color, dimensions, budget, intended use, and design direction.

Relationship-Based Service

We want to become a trusted long-term source for designers who value communication, consistency, and stones with character.

Register for Trade Access
Blue, teal, and green rose cut loose sapphires arranged on wood, selected for custom jewelry accent stones and designer sourcing.

More than a supplier

A Long-Term Gemstone Partner

We want to build lasting relationships with designers who care about the stones behind their work. Our goal is to become a dependable source you can return to for client projects, special requests, and stones that help your designs stand apart.

As our partnership grows, we can better understand the colors, cuts, origins, sizes, and styles you look for most often. That allows us to support your work with more relevant options and a more personal sourcing experience.

Start a Trade Conversation
A stone-first experience for your clients

Let Your Clients Choose the Stone Before the Setting

Many custom jewelry projects begin with the center stone. If your client has not chosen a gemstone yet, you can send them to Caleb B. Quashen to explore rare loose stones before the design process begins.

We help clients understand color, shape, dimensions, origin, and intended use so they can make a more confident decision. Once the stone is selected, you can design the finished piece around its exact proportions and character.

View Custom Jewelry Gemstone Guide
Teal blue-green step cut loose sapphires on natural wood, showcasing rich color and geometric facets for custom jewelry and designer sourcing.
Three blue and white faceted loose gemstones on natural wood, showcasing brilliance and contrast for custom jewelry and designer sourcing.

Recently Added Gemstones for Designer Projects

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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
3.01 carat opalescent purplish pink sapphire shown face-up, displaying modified oval brilliant mix cut faceting and luminous pastel color from Sakaraha, Madagascar.
3.01CT Sapphire: Opalescent Purplish Pink Precision Modified Oval Brilliant Mix Cut
$3,010.00
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89 products

Common Questions for Jewelry Designers

Helpful answers for designers, jewelers, and trade clients sourcing loose gemstones.

Yes. We work with jewelry designers, custom jewelers, and industry clients who are sourcing loose gemstones for client projects, custom rings, pendants, and one-of-a-kind jewelry.

Yes. Designers may send clients to us to browse loose gemstones, ask questions, and purchase a stone before the design process begins. Once the gemstone is selected, the designer can create the finished piece around the stone’s exact dimensions and character.

Qualified jewelry designers, custom jewelers, and industry clients can register for trade access. Once approved, eligible trade accounts can unlock trade pricing on available stones.

You can register through our jeweler registration page. After your information is submitted, we review the account to verify trade eligibility before approving access.

Yes. Our listings include important specifications such as gemstone type, weight, shape and cut, dimensions, origin when known, and treatment information when available.

Our inventory includes loose sapphires, diamonds, tanzanite, spinel, tourmaline, aquamarine, garnet, opal, ruby, and other distinctive gemstones. Inventory changes often as new stones are added.

Yes. If you are looking for a specific color, size, shape, origin, or budget range, contact us with the details. We may be able to suggest available stones or help guide your search.

Yes. Our gemstones are natural unless clearly stated otherwise. We do not sell lab-grown gemstones.

Collage of opalescent loose sapphires in pastel blue, lavender, white, teal, and rainbow tones for custom jewelry and designer sourcing.

Build a lasting sourcing relationship

Make CBQ Your Gemstone Partner

Whether you are sourcing for a current client project or looking for a long-term gemstone partner, we would be honored to connect with you.

Register for Trade Access