Natural Stone Institute

What Natural Stone Institute does

The Natural Stone Institute (NSI) is a U.S.-based nonprofit trade association headquartered in Oberlin, Ohio that serves the North American natural stone industry. Founded in 1903 and rebranded from the Marble Institute of America in 2023, NSI operates a membership model serving stone fabricators, commercial contractors, quarriers, architects, designers, and consumers. Its core offering suite comprises an Accreditation Program (approaching 20 years of operation) recognizing fabricators and contractors meeting industry standards; a CEU Program delivering continuing education approved by AIA, ASLA, GBCI, LACES, and IDCEC; the Natural Stone University online learning platform with individual courses (free for members, $50 for non-members) and a 54-course Natural Stone Academy bundle at $250; an ISO17025-accredited Materials Test Laboratory (TL-1190) registered with the U.S. Army Corps of Engineers and a member of the ASSIMAGRA S.TONE international laboratory network; the Natural Stone Sustainability Standard covering EPDs, HPDs, and life cycle assessments; and a content portfolio including Building Stone Magazine, the Dimension Stone Design Manual, the Supplier-to-Buyer Manual, and the consumer-facing Use Natural Stone portal.

Monetization flows through five streams: recurring membership dues; event registration and sponsorship across Coverings (~25,000 attendees, 40+ country pavilions), StonExpo at TISE, Flooring Sustainability Summit (co-hosted with six peer flooring associations), regional stone summits, and study tours; CEU and education course revenue; testing laboratory services with bundled ASTM physical-property test packages; and publications sales via an online store. GTM is a hybrid direct-membership, self-serve LMS, and event-led motion, supported by social, email, PR, and trade-press distribution.

Operationally, NSI maintains two wholly-owned affiliated entities — the Natural Stone Foundation and Use Natural Stone — and runs program brands including Women in Stone and the R.I.S.E. Program (with the Gary Sinise Foundation). Its headquarters is registered in Michigan operating at an Ohio address (380 E. Lorain Street, Oberlin). Financials are not publicly disclosed; no parent company, investors, or funding rounds are present. The lab manager sits as vice-chair of ASTM C18 and acting chair of ISO/TC 327, which institutionalizes NSI's role as the de facto standards body for the North American natural stone sector.

Name

Natural Stone Institute

Legal name

Natural Stone Institute

Website

https://naturalstoneinstitute.org

Company type

Private

Founded year

1903

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

The Natural Stone Institute is a U.S. nonprofit trade association, founded 1903 and rebranded from the Marble Institute of America in 2023, that serves North American stone fabricators, quarriers, contractors, architects, and designers through accreditation, ISO17025-accredited testing, Natural Stone University CEU education, sustainability standards, and major industry events such as Coverings and StonExpo at TISE.

Ownership category

akta.pro rank

Product category

Industry Trade Association (Natural Stone)

NAICS

Cut Stone and Stone Product Manufacturing (327991), Dimension Stone Mining and Quarrying (212311), Stone Mining and Quarrying (21231)

SIC

Services-Testing Laboratories (8734), Cut Stone & Stone Products (3281), Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400)

akta.pro primary industry

Granite Quarrying & Dimension Stone Fabrication (IMAKAHAD)

akta.pro secondary industries

Natural Stone Cleaning, Polishing & Restoration (Marble/Granite/Travertine/Limestone) (HSAEAOAA), Stone Sealing & Stain Protection (Marble, Granite, Travertine) (HSAGAGAI)

Keywords

• Stone industry association
• Natural stone education
• Stone testing services
• Industry accreditation programs
• Continuing education courses

Headquarters

HQ city

Oberlin

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure, Others

Revenue model

1. Membership Dues: Annual membership fees for stone professionals, fabricators, quarriers, contractors, and related companies in the natural stone industry.
2. Event Registration and Sponsorship: Revenue from industry trade shows including Coverings, StonExpo at TISE, regional stone summits, quarrier summits, fabricator summits, and study tours.
3. Education and CEU Courses: Online courses through Natural Stone University including individual courses (Member FREE, Non-Member $50) and course bundles like Natural Stone Academy ($250).
4. Testing Laboratory Services: ASTM standards testing services for natural stone including bundled physical property testing packages with competitive industry pricing and special rates for members.
5. Publications and Resources: Revenue from Building Stone Magazine subscriptions, Dimension Stone Design Manual, Supplier-to-Buyer Manual, resource library downloads, and online store sales.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels7 records

Core offering

The Natural Stone Institute is a nonprofit trade association that delivers accreditation programs, continuing education (Natural Stone University), CEU courses for architects and designers, an ISO17025-accredited stone testing laboratory, industry standards and sustainability frameworks, advocacy representation, and major industry events (Coverings, StonExpo at TISE, Flooring Sustainability Summit). Its offerings target stone fabricators, commercial contractors, quarriers, architects, and design professionals across the natural stone value chain.

Product overview

The Natural Stone Institute operates as a trade association offering a comprehensive portfolio of products and services for the natural stone industry. The core offerings include an Accreditation Program recognizing fabricators and contractors meeting industry standards; a CEU Program providing continuing education for architects and designers; Natural Stone University as an online education portal; and the NSI Materials Test Laboratory offering ISO17025 accredited testing services. Additional offerings include the Women in Stone initiative, Pinnacle & Tucker Awards, R.I.S.E. Program, and various resources including the Dimension Stone Design Manual, Natural Stone Catalogue, Building Stone Magazine, and Use Natural Stone consumer portal. The association also publishes the Natural Stone Sustainability Standard and maintains an Online Store for publications and resources.

Differentiator

Problem solved

Functional benefit

Brands

• Natural Stone University: Online portal of industry education including webinars, seminars, toolbox talks, and other courses offering transcripts and certificates of completion.
• R.I.S.E. Program
• Women in Stone
• Use Natural Stone

Products and services

• Accreditation Program Recognizes natural stone fabricators and commercial contractors that meet the industry's highest standards for operations, product knowledge, installation, and reliability.
• CEU Program Provides accurate continuing education on the benefits and use of natural stone to the major building and design professions including AIA, ASLA, and GBCI.
• Natural Stone University Online education portal offering webinars, seminars, toolbox talks, safety courses, CEU programs, and industry courses with transcripts and certificates of completion for stone professionals and the design community.
• Silica & Slab Safety Certificate Online safety training certificate including education and resources for preventing silicosis, safe slab handling, and creating a safety program for natural stone industry employees.
• NSI Materials Test Laboratory State-of-the-art ISO17025-accredited testing and reporting capabilities for natural stone properties and evaluation, including physical properties testing, environmental exposure testing, and petrographic analysis. Registered with the Army Corps of Engineers for C97 testing and member of the ASSIMAGRA S.TONE laboratory network.
• Women in Stone A system of resources to recruit, retain, and advance women in the stone industry, including mentorship, career path awareness, networking, and education specific to women's needs.
• Pinnacle & Tucker Awards Annual awards recognizing individuals, design professionals, and member companies that make exceptional contributions through their work within the global natural stone industry, including Tucker Design Awards and Pinnacle Awards.
• R.I.S.E. Program Program, in partnership with the Gary Sinise Foundation, that builds homes for wounded veterans using natural stone, supporting natural stone industry professionals through various initiatives and resources.
• Dimension Stone Design Manual Technical resource manual for dimension stone design, providing specifications, testing methods, and guidelines for architects, engineers, and stone industry professionals.
• Natural Stone Sustainability Standard Industry sustainability standard providing guidelines for sustainable sourcing and responsible manufacturing practices for quarriers and fabricators, including Environmental Product Declarations (EPDs), Health Product Declarations (HPDs), life cycle assessments, and certified sustainable stone materials.

Quantifiable outcome

• NSI accreditation approaching 20 years of recognizing fabricators and contractors meeting highest industry standards
• +2 more outcomes

Named customers3 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

14 partnerships are on record, tiered core and minor.

• Carpet and Rug InstitutecoreStrategic or Co-development PartnerCo-host of Flooring Sustainability Summit, one of six major flooring industry associations that serve as primary organizers of the annual event bringing together industry leaders, policymakers, and sustainability professionals.
• National Wood Flooring AssociationcoreStrategic or Co-development PartnerCo-host of Flooring Sustainability Summit, one of six major flooring industry associations organizing the annual sustainability event for the flooring sector.
• North American Laminate Flooring AssociationcoreStrategic or Co-development PartnerCo-host of Flooring Sustainability Summit, one of six major flooring industry associations organizing the annual sustainability event for the flooring sector.
• Resilient Floor Covering InstitutecoreStrategic or Co-development PartnerCo-host of Flooring Sustainability Summit, one of six major flooring industry associations organizing the annual sustainability event for the flooring sector.
• Tile Council of North AmericacoreStrategic or Co-development PartnerCo-host of Flooring Sustainability Summit, one of six major flooring industry associations organizing the annual sustainability event for the flooring sector.
• CoveringscoreStrategic or Co-development PartnerNorth America's leading international tile and stone showcase, co-hosted with NSI sponsorship and programming involvement. Coverings 2026 scheduled March 30 - April 2 at Las Vegas Convention Center with 40+ country pavilions and nearly 25,000 expected attendees.
• MarmomacminorStrategic or Co-development PartnerInternational stone industry event with NSI partnership and presence. NSI website sponsors Marmomac alongside other industry events.
• StonExpo at TISEcoreStrategic or Co-development PartnerMajor stone industry trade show co-produced with The International Surface Event (TISE), North America's marketplace for flooring, stone and tile innovation. Event scheduled January 27-29, 2026 at Mandalay Bay Convention Center, Las Vegas.
• International Interior Design Association (IIDA)minorStrategic or Co-development PartnerPartner organization for Flooring Sustainability Summit, with IIDA CEO Cheryl Durst delivering closing keynote at the third annual event in July 2026.
• Andersen CorporationminorStrategic or Co-development PartnerPartner organization for Flooring Sustainability Summit, with Chief Sustainability Officer George Bandy Jr. delivering opening keynote on global sustainability strategy.
• Schluter SystemsminorStrategic or Co-development PartnerSponsor and supporter of Flooring Sustainability Summit education programming, providing support for CEU credits and session content on material health transparency, circularity, and supply chain alignment.
• UNLV Architecture StudentsminorStrategic or Co-development PartnerAcademic partnership for Coverings programming, with UNLV architecture students participating in collaborative programming at the annual tile and stone industry show.
• USGBC (U.S. Green Building Council)minorStrategic or Co-development PartnerNSI website sponsor and partner for green building initiatives, promoting natural stone alignment with LEED and sustainable building practices.
• Natural Stone CouncilminorStrategic or Co-development PartnerSilver sponsor of NSI website, organization focused on sustainable natural stone sourcing and responsible manufacturing best practices.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Carpet and Rug Institute (CRI): U.S. trade association for the carpet and rug industry and co-host of the Flooring Sustainability Summit. Directly comparable to NSI in non-profit trade-association structure, sustainability-standard development, and member certification offerings.
• Building Stone Institute (BSI): A separate U.S.-based trade association serving the building stone industry, including quarriers, fabricators, and installers. Direct comparable to NSI in mission and member base, though smaller and more narrowly focused on building-stone applications.
• National Wood Flooring Association (NWFA): North American trade association for the wood flooring industry and co-host of the Flooring Sustainability Summit. Operates a comparable membership-plus-education-plus-certification model, including technical manuals and installer accreditation programs analogous to NSI's.
• Tile Council of North America (TCNA): The principal North American tile industry trade association and a strategic co-host of the Flooring Sustainability Summit alongside NSI. Comparable in structure, membership-model revenue, CEU programs, and co-hosting of Coverings, making it the closest non-stone peer to NSI.
• Resilient Floor Covering Institute (RFCI): Trade association representing resilient flooring manufacturers and a co-host of the Flooring Sustainability Summit. Directly comparable to NSI in non-profit structure, sustainability-standard focus, and member certification programs.

Emerging players

• North American Laminate Flooring Association (NALFA): North American trade association for laminate flooring and a co-host of the Flooring Sustainability Summit. Smaller and narrower in scope than NSI, but operationally similar in certification-driven membership model.
• Natural Stone Council: Sustainability-focused stone industry organization and NSI website sponsor focused on responsible sourcing and manufacturing best practices. Comparable as a stone-sector non-profit with overlapping sustainability/EPD mandate, though narrower in scope.

Regional players

• ASSIMAGRA (S.TONE Laboratory Network): Portuguese-based international stone industry association whose S.TONE laboratory network partners with NSI's testing lab. Comparable as a stone-industry trade body with technical testing infrastructure, but primarily serving European and Lusophone markets.

Broad incumbents

• American Institute of Architects (AIA): Large U.S. professional association for architects whose members are key consumers of NSI's CEU programs (Natural Stone University delivers AIA-approved continuing education). Comparable as a CEU-driven professional association, though materially larger in scope and membership.
• ASTM International (C18 Committee): Global standards body whose C18 committee on dimension stone develops the ASTM standards NSI's testing lab executes. NSI's lab leadership sits on C18 and ISO/TC 327, making ASTM both a peer-in-standards and a key ecosystem participant.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/NaturalStoneInstitute
• Facebookfacebook.com/naturalstoneinstitute
• LinkedInlinkedin.com/company/4035309
• Instagraminstagram.com/naturalstoneinstitute
• Xx.com/marbleinstitute

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Natural Stone Institute