Before a ring or pendant is ever cast in metal, it usually exists first as a digital model and then as a physical prototype. That early stage is where a design is proven, refined, and approved, and it is often what separates a finished piece that matches your vision from one that disappoints. Manhattan, and the Diamond District in particular, is home to studios that specialize in this exact work. Whether you are a designer testing a collection or a private client commissioning a one-of-a-kind piece, the studios below are known for strong custom jewelry prototyping and 3D modeling. Here are seven worth knowing in 2026.
1. CadCamNYC
CadCamNYC leads this list as a full-service custom jewelry studio in Manhattan with more than 20 years of experience. The studio combines CAD modeling and 3D printing with hands-on craftsmanship, taking a design from sketch to a realistic 3D render to a finished piece. Its walk-in studio lets you meet a specialist in person, review your model, and request as many revisions as needed before anything is produced, all supported by a personal job coordinator.
Best known for:
- A walk-in Manhattan studio with in-person, hands-on consultations
- Unlimited model revisions before production begins
- A lifetime warranty covering checkups, polishing, wear and tear, and sizing
2. 3DM Jewelry Design Studio
Located on West 47th Street, 3DM Jewelry Design Studio focuses specifically on 3D precision CAD jewelry design and prototyping. It serves independent designers, retail stores, online businesses, and private customers, with services spanning CAD modeling, high-definition wax printing, and high-resolution rendering. The studio also runs a mentorship program, which makes it a useful option for newer designers learning the digital side of the trade.
Best known for:
- High-definition 3D wax printing and rapid prototyping
- A one-on-one mentorship program for designers
- High-resolution renderings and HD video animation
3. Tech-Designs NY
Tech-Designs NY operates in the Diamond District and offers CAD, 3D printing, casting, scanning, and finishing under one roof. For prototyping specifically, the studio provides high-resolution wax printing and structured-light 3D scanning with fine micron-level precision. It works on a trade basis with jewelers, designers, and retailers, honors NDAs, and emphasizes secure handling of design files.
Best known for:
- Structured-light 3D scanning at 10 to 20 micron precision
- Trade-only service with NDAs and protected file handling
- A full CAD-to-cast workflow in one Midtown location
4. CADMaster Jewelry Design Studio
CADMaster specializes in 3D CAD jewelry design, modeling, and rendering. Designers can submit a sketch or describe a concept, and the studio turns it into a detailed 3D model. CADMaster also produces photo and video renders from the model, which can support a marketing campaign or a client presentation before the piece moves into production.
Best known for:
- Detailed 3D modeling from a sketch or written concept
- Photo and video renders for marketing and presentations
- Bas-relief and haut-relief design work
5. ITI NYC
ITI NYC operates one of the largest showrooms in the Diamond District and provides CAD design services alongside its retail operation. Its in-house CAD designers build 3D models from a client's concept, and every finished piece passes through a quality-assurance inspection for metal quality and craftsmanship. The mix of a large showroom and in-house digital design suits clients who want to see options in person.
Best known for:
- One of the largest showrooms in the Diamond District
- In-house CAD design alongside retail
- A quality-assurance inspection on every piece
6. Couture Jewelry
Couture Jewelry is a Diamond District atelier that brings together CAD designers, master jewelers, and in-house casting. The studio uses 3D technology for custom engagement rings and for specialized work like recreating a lost earring or duplicating a piece from an heirloom set. Working from a private floor rather than a street-level storefront, it offers a quieter, consultation-focused setting.
Best known for:
- Precision CAD design paired with in-house casting
- Heirloom recreation and redesign using 3D technology
- A private atelier setting away from street-level retail
7. Maroth Jewels
Maroth Jewels uses 3D printing to create physical prototypes before full production, which helps confirm a design meets expectations before metal is committed. The company also serves wholesale clients, and its use of digital tools reduces material waste during prototyping. For buyers who want to see and approve a physical sample early, its prototype-first approach is the defining strength.
Best known for:
- Physical prototypes produced before full production
- Wholesale and online jewelry supply
- A digital workflow that reduces material waste
Choosing the Right Studio
The best fit depends on your project. Designers protecting original work may prioritize studios with NDAs and trade-only services, while first-time private clients often value in-person guidance and a walk-in setting. When you compare options, ask how many revisions are included, how prototypes are produced, and how the studio moves from an approved model into production. Strong custom jewelry prototyping is collaborative, so the studio that communicates clearly and keeps you involved is usually the one that delivers a finished piece closest to your vision.