World Diamond Group

What World Diamond Group does

World Diamond Group S.p.A. is an Italian holding company headquartered in Vicenza that operates a portfolio of five jewelry brands—Golay, XDiamond, Mikiko, Nihama, and Atelier del Gioiello—manufacturing and distributing certified natural diamond, lab-grown diamond, pearl, and precious gemstone jewelry. Founded in 1987 as a diamond importer and reorganized over time into a multi-brand group, the company operates handcrafted production in Vicenza workshops, an internal gemological laboratory, and proprietary lab-grown diamond synthesis capabilities using High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD) processes. All jewelry is certified by leading international gemological institutes (GIA, IGI, HRD), and authenticity verification is supported at retail partners through proprietary Diamond Detector technology that distinguishes natural from laboratory-grown stones.

The company sells almost exclusively through B2B channels via a curated authorized-retailer network, supplemented by Atelier del Gioiello bespoke commissions and a small direct-to-consumer e-commerce shop for select XDiamond and Mikiko products. Distribution is supported by a dedicated B2B portal (btb.worlddiamondgroup.com), brand-specific Instagram accounts, gemological content marketing, and exclusive upstream partnerships—including an exclusive Italy-wide De Beers Forevermark agreement since 2018 and an exclusive worldwide co-branding arrangement with Martin Rapaport (RDC). Pricing is not publicly disclosed; revenue is generated through wholesale orders from retail partners and premium Atelier commissions, with warranty and theft-replacement programs enhancing after-sale value.

In September 2019, World Diamond Group acquired Golay Buchel Italia, integrating the Golay, Mikiko, and Nihama brands and expanding into pearls, silver, and semi-precious materials. The business employs 11–50 people, has a registered share capital of €5,000,000, and reports primary operations in Italy with secondary exposure to Japan via Mikiko. Ownership remains concentrated with founder Castrenze Giuliano; no external institutional investment has been disclosed.

Name

World Diamond Group

Legal name

World Diamond Group S.p.A.

Website

https://worlddiamondgroup.com

Company type

Private

Founded year

1987

Operating status

Operating

Headcount range

11–50 employees

Short description

World Diamond Group is a privately held Italian B2B jewelry holding company managing five brands (Golay, XDiamond, Mikiko, Nihama, Atelier del Gioiello), producing handcrafted certified diamond, lab-grown diamond, pearl, and gemstone jewelry distributed exclusively through authorized high-end retailers in Italy and select international markets.

Ownership category

akta.pro rank

Headquarters

HQ city

Vicenza

HQ country

Italy

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Wholesale Jewelry Sales: World Diamond Group operates as a B2B wholesale supplier, selling jewelry collections exclusively through a network of authorized high-end retailers. Products include natural diamond jewelry, lab-grown diamond jewelry (XDiamond brand), pearl jewelry, and precious gemstone pieces. The company generates revenue through bulk orders from its retail partner network.
2. Atelier Custom Jewelry: Exclusive bespoke jewelry creations through the Atelier del Gioiello brand, featuring unique pieces designed around exceptional gemstones. These represent premium, one-of-a-kind creations with higher price points.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

World Diamond Group is an Italian jewelry holding company that designs, manufactures and wholesales certified fine jewelry through five brands (Golay, XDiamond, Mikiko, Nihama, Atelier del Gioiello) covering natural diamonds, lab-grown diamonds, cultured pearls, and precious gemstones. The company sells primarily to authorized high-end retailers through a B2B partner portal, while also operating a direct e-commerce shop and an Atelier for bespoke creations. All jewelry is handcrafted in the Vicenza workshop and backed by international gemological certifications (GIA, IGI, HRD, RDC, Forevermark Code of Origin).

Product overview

World Diamond Group is an Italian high-end jewelry company headquartered in Vicenza, founded in 1987. It operates as a holding company managing a portfolio of five distinct jewelry brands: Golay (luxury women's jewelry with diamonds and pearls), XDiamond (lab-grown diamond jewelry for ethical luxury), Mikiko (pearl-focused minimalist elegance), Nihama (silver and pearl contemporary fashion jewelry), and Atelier del Gioiello (ultra-exclusive bespoke pieces). The company crafts all jewelry by hand in Italy, working with natural diamonds, lab-grown diamonds, pearls, and precious gemstones (rubies, sapphires, emeralds), backed by international certifications from GIA, IGI, HRD, and proprietary Diamond Detector technology for retailers.

Differentiator

Problem solved

Functional benefit

Brands

• Golay: Luxury women's jewelry brand featuring diamonds and pearls, with collections including Bridal, Design, and Basic Perle lines. Collections include Grace, Swing, Infinite Love, Lightkube, Amami, Smart, Prokube, Mariposa Antea, and Flor.
• XDiamond
• Mikiko
• Nihama
• Atelier del Gioiello (The Only One)

Products and services

• Golay Luxury women's jewelry brand offering collections of diamonds, precious stones, and pearls (Grace To Love, Bridal, Design, Basico Perle, among others), handcrafted in Vicenza, Italy, and sold through authorized high-end jewelry retailers.
• XDiamond Lab-grown diamond jewelry brand producing pieces via HPHT and CVD synthesis processes, offering ethical and sustainable luxury at more accessible price points while maintaining the same physical, chemical and optical properties as natural diamonds; sold through authorized retailers and direct e-commerce.
• Mikiko Pearl-focused jewelry brand featuring minimalist, timeless designs inspired by Eastern aesthetics combined with Italian craftsmanship, intended for everyday refined wear and sold through authorized retailers and direct e-commerce.
• Nihama Contemporary jewelry brand combining silver and pearls into fashion-forward, glamorous pieces for modern women seeking personal style and elegance, distributed through authorized jewelry retailers.
• Atelier del Gioiello (The Only One) Bespoke jewelry service offering unique, one-of-a-kind handmade pieces built around rare, internationally certified gemstones (diamonds, rubies, sapphires, emeralds), custom-designed and handcrafted by master goldsmiths in Vicenza.
• Diamond Detector Specialized detection device/service provided to authorized retail partners to quickly and easily distinguish natural diamonds from laboratory-grown diamonds, supporting transparency at the point of sale.

Quantifiable outcome

• 24-month international warranty on all jewelry pieces
• +1 more outcomes

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Six partnerships are on record, tiered core.

• De Beers Group / ForevermarkcoreStrategic or Co-development Partner · 1 January 2018Since 2018, World Diamond Group has been the exclusive partner of the De Beers Group for the Forevermark brand in Italy. This collaboration allowed the company to preview the Code of Origin certificate in the Italian market, the first official document attesting to the origin of De Beers diamonds. Each Code of Origin diamond features a unique code engraved on the table and reported on the certificate.
• Martin Rapaport / Rapaport (RDC)coreGTM or Marketing PartnerExclusive worldwide co-branding partnership with Martin Rapaport. World Diamond Group is the only classic jewelry brand certified directly by Rapaport (RDC). Diamonds with RDC certification meet premium excellence parameters established by Rapaport and are already certified by GIA, the world's most authoritative gemological institute.
• GIA (Gemological Institute of America)coreTechnology or IntegrationThe most prestigious and globally recognized diamond certification body. Famous for defining the 4C system (Cut, Clarity, Color, Carat). GIA provides the highest standard of rigor, impartiality, and authority for industry professionals and consumers.
• IGI (International Gemological Institute)coreTechnology or IntegrationOne of the most widespread and authoritative gemological laboratories internationally. The only one controlled by a central governing body and adhering to a uniform and recognized classification system. Issues certifications for diamonds, gems, and finished jewelry.
• HRD (Hoge Raad voor Diamant / Alto Consiglio dei Diamanti)coreTechnology or IntegrationFounded in Antwerp, HRD is the European counterpart to GIA. Recognized for its precision and scientific consistency, it issues certifications for diamonds, precious stones, and jewelry according to rigorous and transparent international standards.
• Kimberley ProcesscoreStrategic or Co-development PartnerWorld Diamond Group adheres to the ethical principles of the Kimberley Process, an international UN protocol that binds members to establish a chain of countries that only trade 'clean/ethical' diamonds. The process ensures no diamonds are imported from or exported to non-member countries and prevents diamond trade from financing rebel groups or terrorist organizations.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Crivelli: Italian fine jewelry brand founded in 1972 in Recanati, known for hand-engraved gold and gemstone jewelry. Comparable as a small-to-mid sized Italian fine jewelry manufacturer with similar craftsmanship-led, branded wholesale distribution.
• Roberto Coin: Italian fine jewelry house founded in 1996 in Vicenza, producing gold and gemstone jewelry with a signature ruby hidden inside each piece. Comparable as a Vicenza-based artisanal jewelry maker with a global wholesale and boutique distribution model.
• Damiani Group: Italian fine jewelry manufacturer founded in 1924 in Valenza, producing diamond, pearl, and colored-gemstone jewelry under multiple brands (Damiani, Salvini, Alfieri & St. John, Bliss, Calderoni). Directly comparable as a multi-brand Italian fine jewelry producer/wholesaler serving independent retail partners.
• Leo Pizzo: Italian fine jewelry brand based in Valenza, producing handcrafted gold and gemstone jewelry. Comparable as a heritage Italian jewelry maker serving high-end retailers with similar artisanal positioning and B2B distribution.
• Pomellato: Italian fine jewelry brand founded in 1967 in Milan, now part of Kering, producing gold and colored gemstone jewelry. Comparable as an Italian-made fine jewelry brand with bridal and luxury positioning, though now backed by a major luxury group.
• Buccellati: Italian heritage fine jewelry brand founded in 1919 in Milan, known for hand-engraved silver and gold jewelry, now part of Richemont. Comparable as a heritage Italian fine jewelry maker with similar craftsmanship positioning and bridal/occasion jewelry line.
• Pianegonda: Italian fine jewelry brand founded in Vicenza in 1980s, producing silver and gold jewelry with contemporary design. Comparable as a Vicenza-based Italian fine jewelry maker of similar scale targeting independent retailers and end consumers.
• Recarlo: Italian fine jewelry brand founded in 1967 in Valenza, producing diamond and gemstone engagement and bridal jewelry. Comparable as an Italian-made bridal/diamond jewelry specialist with wholesale distribution through authorized jewelers, similar to Golay's bridal positioning.
• Mattioli Gioielli: Italian fine jewelry house founded in Turin in 1920s, producing gold and gemstone jewelry. Comparable as a multi-generational Italian jewelry maker with similar brand-led wholesale distribution model.

Broad incumbents

• Bulgari: Italian luxury jewelry maison founded in 1884 in Rome, now part of LVMH, producing fine and high jewelry with diamonds, pearls, and colored gemstones. Comparable as a heritage Italian fine jewelry powerhouse, but operates at vastly larger scale with global retail and a high-jewelry focus.

Market position

Strengths1 record

Weaknesses1 record

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/worlddiamondgroup
• Facebookfacebook.com/worlddiamondgroup
• LinkedInlinkedin.com/company/world-diamond-group
• Instagraminstagram.com/worlddiamondgroup

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries1 record

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 World Diamond Group