Jewel Star

What Jewel Star does

Jewel Star is a privately-held Indian diamond company founded in 1968 in Bhavnagar by Rajabhai Koshiya as a job-work cutting and polishing operation. The business is now controlled by the Koshiya family, with Mavjibhai Koshiya serving as chairman, and has scaled to manufacturing facilities in Mumbai and Surat with corporate-disclosed headcount of over 10,000 employees. Jewel Star's operations span the full diamond value chain: rough diamond procurement, in-house cutting and polishing, and B2B distribution of conflict-free polished diamonds to retailers, wholesalers, jewellery manufacturers, chain stores, online retailers, diamond manufacturers, traders, and brokers.

The company's technology stack is anchored by custom-built in-house ERP and CRM systems that track material flow from procurement to end customer and provide supply chain transparency. Its proprietary JS Grading System assesses polished diamonds using the standard 4Cs (Clarity, Color, Cut, Carat) plus fourteen additional subfactors (Fluorescence, Inclusions, Measurements, Heart & Arrow, White/Black Inclusion, Milky, Luster, Open Inclusion, Extra-Facet) across fifteen diamond shapes including proprietary CU Brilliant and CU Plasma cuts. Diamond procurement and bidding occur through the company's own e-commerce platform at jewelstar.co.in, complemented by native iOS and Android applications and an auction-style 'Offer At Your Price' (OAYP) feature on Discount Tagged stones.

Jewel Star generates revenue through one-time B2B transactions in polished diamond trading and transaction-fee pricing on cutting/polishing job work and OAYP auction sales. Distribution is global, with HQ at the Bharat Diamond Bourse in Mumbai's BKC financial district and active buyer outreach via WeChat, Skype, WhatsApp, and LinkedIn. The company is a member of the Responsible Jewellery Council, complies with the Kimberley Process Certification Scheme, and implements the OECD five-step due diligence framework for responsible supply chains. Pricing is not publicly disclosed and varies by stone characteristics, buyer registration category, and OAYP bid outcomes.

Name

Jewel Star

Legal name

Jewel Star

Website

https://jewelstar.co.in

Company type

Private

Founded year

1968

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Jewel Star is a privately-held Indian diamond trading, cutting, and polishing company founded in 1968, serving global B2B buyers including retailers, wholesalers, jewellery manufacturers, and traders through its proprietary JS Grading System and online auction platform.

Ownership category

akta.pro rank

Product category

Diamond Trading & Manufacturing

NAICS

Jewelry, Watch, Precious Stone, and Precious Metal Merchant Wholesalers (42394), Jewelry, Watch, Precious Stone, and Precious Metal Merchant Wholesalers (423940)

SIC

Jewelry, Precious Metal (3911), Wholesale-Jewelry, Watches, Precious Stones & Metals (5094)

akta.pro primary industry

Fine Jewelry Manufacturing (Precious Metals & Gem-Set) (CRAKAIAA)

akta.pro secondary industries

Polished Diamond Trading & Brokerage (CRAKAJAD), Diamond & Gemstone B2B Exchanges/Marketplaces (CRAKAJAJ)

Keywords

• Diamond trading
• Diamond cutting polishing
• Polished diamond wholesale
• Gemstone distribution
• B2B jewelry supply

Headquarters

HQ city

Mumbai

HQ country

India

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Diamond Trading: Trading of polished diamonds through their online platform and mobile applications. B2B model targeting wholesalers, retailers, jewellery manufacturers, and traders.
2. Diamond Cutting and Polishing: Manufacturing operations for cutting and polishing diamonds. Started in 1968 as job work for other merchants and evolved into their own production.
3. Online Diamond Auction (OAYP): Bidding platform where buyers can offer their prices on discounted stones. Transaction-based model where prices are negotiated through the platform.

Go-to-market motion2 records

Distribution channels4 records

Marketing channels8 records

Core offering

Jewel Star is an integrated diamond manufacturer and trader that cuts, polishes, and sells polished, conflict-free diamonds primarily to B2B buyers (retailers, wholesalers, jewellery manufacturers, chain stores, online retailers, diamond manufacturers, traders, and brokers). The company operates proprietary online e-commerce and mobile app channels (jewelstar.co.in, iOS, Android) with diamond search, the proprietary JS Grading System, and an 'Offer At Your Price' (OAYP) bidding feature on 'Discount Tagged' stones. Manufacturing is performed at its own facilities in Mumbai and Surat, India, and the company is RJC-certified and Kimberley Process-compliant.

Product overview

Jewel Star is a diamond trading, cutting, and polishing company founded in 1968, operating as both a manufacturer and online retailer. Its core product portfolio consists of conflict-free diamonds assessed through the proprietary JS Grading System, which evaluates stones using the 4Cs plus additional subfactors. The company offers an e-commerce platform accessible via website and dedicated iOS and Android mobile applications. A notable feature is the 'Offer At Your Price' (OAYP) bidding system, allowing buyers to negotiate prices on tagged stones. The company operates manufacturing facilities in Mumbai and Surat, India, with over 10,000 employees.

Differentiator

Problem solved

Functional benefit

Brands

• JS Grading: Jewel Star's professional diamond grading system that assesses diamonds using 4Cs (Clarity, Color, Cut, Carat Weight) plus subfactors including Fluorescence, Inclusions, Measurements and Heart&Arrow.

Products and services

• Polished Diamonds Conflict-free polished diamonds available for B2B purchase through the jewelstar.co.in e-commerce platform and Jewel Star mobile applications (iOS, Android, iPad). Buyers can search and browse stones assessed via the proprietary JS Grading System and, where applicable, place bids on 'Discount Tagged' stones via the OAYP feature. Customers must register as a Retailer, Wholesaler, Jewellery Manufacturer, Chain Store, Online Retailer, Diamond Manufacturer, Trader, or Broker before purchasing.
• Diamond Cutting and Polishing Services Manufacturing services for cutting and polishing rough diamonds, originally offered as job work to other diamond merchants and now an integrated component of Jewel Star's operations supporting its diamond trading business and third-party processing needs. Operations are conducted at the company's manufacturing facilities in Mumbai and Surat, India, supported by an in-house ERP system that ensures timely supply duties with exact precision.

Quantifiable outcome

• Over 10,000 employees across factories
• +1 more outcomes

Segments8 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Responsible Jewellery Council (RJC)coreOthersJewel Star is a member of the Responsible Jewellery Council (RJC), committing to operating in accordance with the RJC Code of Practices. This membership ensures third-party verification of ethical, human rights, social and environmental practices throughout the supply chain. The company undergoes independent third-party auditing to verify responsible business practices.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Almod Diamonds: Indian manufacturer and global supplier of polished diamonds, headquartered in Mumbai with Surat manufacturing. Competes in the same mid-market B2B segment as Jewel Star.
• KGK Group: Global diamond, gemstone, and jewelry manufacturing group with significant operations in India (including Surat). Competes in the same B2B polished diamond supply segment and serves similar global wholesale customers.
• Asian Star Company: Mumbai-headquartered, publicly listed diamond manufacturer and trader with global B2B distribution. Comparable on product (polished diamonds), geography (Mumbai BDB), and customer base (wholesalers, retailers, jewelry manufacturers).
• Rosy Blue: One of the world's leading diamond manufacturers and suppliers with Indian manufacturing operations and global B2B distribution. Comparable by product mix, customer base (jewelers and retailers), and supply chain integration.
• Diarough Group: Global diamond manufacturing and trading group with significant operations in India. Operates a B2B polished diamond model serving retailers, wholesalers, and jewelry manufacturers — directly comparable to Jewel Star's customer segments.
• Kiran Gems: Among the world's largest diamond manufacturing groups, headquartered in Mumbai with Surat manufacturing. Operates B2B polished diamond supply to global brands and retailers — direct scale and business model match for Jewel Star.
• Leo Schachter Diamonds: Global diamond cutting and manufacturing group with India-based manufacturing operations, supplying polished diamonds to wholesalers, retailers, and jewelry manufacturers worldwide. Direct comparable on B2B polished diamond supply.
• Shree Ramkrishna Exports (SRK): Largest natural diamond manufacturer and exporter in India, based in Surat, with vertically integrated cutting, polishing, and global B2B distribution. Closest comparable by scale, location, and B2B model to Jewel Star.
• Hari Krishna Group (HK): Vertically integrated Indian diamond manufacturer, cutter, and exporter with operations in Surat and global sales offices. Similar dual-site manufacturing and B2B wholesale model as Jewel Star.

Emerging players

• Stellar Diamonds (Sunrise Diamonds): India-based polished diamond manufacturer with online B2B platform focus. Smaller than Jewel Star but pursues a similar digital-first B2B model with proprietary inventory and grading systems, making it an emerging comparable.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/jewelstardiamonds
• LinkedInlinkedin.com/company/jewelstardiamonds
• Instagraminstagram.com/jewelstardiamonds/?r=nametag

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 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 Jewel Star