What China Stone does

China Stone Ltd (operating as CS International Co., Ltd.) is a Bangkok-headquartered manufacturer of precision machine-cut calibrated natural gemstones, founded in 2004 with vertically integrated mining, cutting, and manufacturing operations in Thailand and China. Its product line spans five gemstone families (ruby, sapphire, amethyst, chrome tourmaline, and tsavorite) delivered in three cut styles (Round Brilliant, Round Cabochon, and Square Princess) across a 0.80mm to 3.50mm size range, with reported on-hand stock exceeding 10 million stones. The company sells exclusively on a trade B2B basis and reports a customer base of more than 500 luxury watch and jewelry brands, with a per-piece price band of $1.50 to $45.00.

The core technology is precision calibrated cutting rather than AI or software: uniform-size and uniform-cut stones are produced for downstream assembly into watch movements and fine jewelry settings, where interchangeability and tight tolerances are commercially decisive. A proprietary B2B extranet platform supports direct ordering, while authorized dealers such as Minerasia SRL in Italy extend regional coverage. The business carries Responsible Jewellery Council membership and aligns sourcing with the Kimberley Process and OECD Due Diligence Guidance, and operates approximately 100 kW of solar generation at its manufacturing sites, both of which support ESG-compliant procurement by EU and US luxury buyers.

The revenue model is straightforward wholesale: per-piece unit pricing multiplied by high-volume, multi-SKU throughput into tier-1 and tier-2 watch and jewelry manufacturers. Geographic reach is concentrated in Switzerland, the USA, Italy, Thailand, and China, with Bangkok serving as the commercial headquarters and the Jewelry Trade Center as its address. The company is privately held, with no public listing, no disclosed funding rounds, and no AI/ML capability referenced in the available information.

Name

China Stone

Legal name

China Stone Ltd

Website

https://thechinastone.com

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

251–500 employees

Short description

China Stone Ltd is a Bangkok-headquartered, vertically integrated manufacturer of precision machine-cut calibrated natural gemstones (ruby, sapphire, amethyst, chrome tourmaline, tsavorite) selling wholesale to more than 500 luxury watch and jewelry brands across Switzerland, the USA, Italy, Thailand, and China.

Ownership category

akta.pro rank

Product category

Precision-Cut Calibrated Natural Gemstones

NAICS

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

SIC

Wholesale-Jewelry, Watches, Precious Stones & Metals (5094), Jewelry, Silverware & Plated Ware (3910)

akta.pro primary industry

Colored Gemstone Cutting & Polishing (Lapidary) (CRAKAJAB)

akta.pro secondary industry

Polished Gemstone Trading & Brokerage (CRAKAJAF)

Keywords

• Precision-cut natural gemstones
• Calibrated colored gemstones
• Fine jewelry manufacturing supply
• Watch component gemstones
• Gemstone wholesale trade

Headquarters

HQ city

Bangkok

HQ country

Thailand

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Gemstone Sales: Direct sales of precision-cut calibrated natural gemstones to fine jewelry manufacturers, watchmakers, and luxury trade professionals. Products sold include rubies, sapphires, amethyst, chrome tourmaline, tsavorite, and other precious stones in various cuts (round brilliant, round cabochon, square princess). All gemstones are 100% natural, cut and polished in their own factories.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

China Stone manufactures and globally supplies precision machine-cut calibrated natural gemstones — including rubies, sapphires (blue, pink, yellow, white, black, lavender, grey), amethyst, chrome tourmaline, and tsavorite — in round brilliant, round cabochon, and square princess cuts. The company sells exclusively on a trade-only B2B basis to verified luxury-industry professionals (fine jewelry manufacturers, watchmakers, designers) through its secure extranet and authorized dealer network, holding over 10 million stones in stock with computerized precision tolerances.

Product overview

China Stone is a world-leading manufacturer and provider of precision machine-cut natural gemstones for the fine jewelry and watch industries. The company operates primarily as a gemstone supplier offering a portfolio of calibrated natural gemstones including Ruby, Sapphire (in multiple color variants: blue, pink, yellow, white, black, lavender, grey), Amethyst, Chrome Tourmaline, and Tsavorite. Products are available in three precision cut styles: Round Brilliant, Round Cabochon, and Square Princess, with sizes ranging from 0.80mm to 3.50mm. The company utilizes state-of-the-art automated cutting technology with digital precision controls and maintains over 10 million stones in stock. The core product offering is supported by an online cataloging and inventory system, an Order Center for e-commerce transactions, and a secure Trade Extranet Platform for qualified trade members. China Stone offers products in a price range of USD 1.50 to 45.00 per piece and maintains three-tier calibration for color, clarity, size, and shape consistency.

Differentiator

Problem solved

Functional benefit

Products and services

• Ruby (natural calibrated) Natural ruby (Corundum, variety Ruby), hardness 9, density 4, RI-1 1.762, RI-2 1.77, available in round brilliant, round cabochon, and square princess cuts in sizes 0.80–3.50mm with color grades RB100–RB300, for fine jewelry manufacturers and watchmakers.
• Sapphire — Blue (natural calibrated) Natural blue sapphire (Corundum, variety Sapphire), hardness 9, available in calibrated sizes 0.80–3.00mm with comprehensive color grading, for fine jewelry manufacturers and watchmakers.
• Amethyst (natural calibrated) Natural amethyst (Quartz, variety Amethyst), hardness 7, density 2.65, RI-1 1.543, RI-2 1.553, available in calibrated sizes 1.00–3.00mm with color grades AM100–AM500, for fine jewelry manufacturers and designers.
• Chrome Tourmaline (natural calibrated) Natural chrome tourmaline (Tourmaline, variety Chrome-Tourmaline) sourced exclusively from Tanzania, hardness 7.5, density 3.06, RI-1 1.624, RI-2 1.644, available in calibrated sizes 1.00–3.00mm with color grades CT050–CT600, for fine jewelry manufacturers.
• Tsavorite (natural calibrated) Natural tsavorite (Garnet, species Grossular) colored green by vanadium and chromium, density 3.61, RI-1 1.73, RI-2 1.75, available in calibrated sizes 0.80–3.00mm with color grades TS050–TS600, for fine jewelry manufacturers.
• Round Brilliant Cut (natural calibrated gemstones) High-precision calibrated round brilliant cut natural gemstones featuring exceptional symmetry and polish, min size 0.80mm, max 3.00mm, increment 0.05mm, tolerance 0.03mm, for fine jewelry and watch mesh settings.
• Round Cabochon Cut (natural calibrated gemstones) Round cabochon cut natural gemstones with smooth, polished surface, designed for specific jewelry settings and watch applications.
• Square Princess Cut (natural calibrated gemstones) Square princess cut natural gemstones with precision calibration, min size 1.50mm, max 3.00mm, featuring exceptional dimensional consistency, for fine jewelry.
• Order Center (trade e-commerce platform) E-commerce services designed for channel partners and qualified business customers to conduct gemstone transactions efficiently, including pricing, ordering, and transaction management.
• Trade Extranet Platform Secure extranet platform for qualified members of the luxury industry providing access to inventory, pricing, and ordering; requires account registration with authorization code or trade reference verification.

Quantifiable outcome

• Over 10 million precision-cut calibrated stones in stock for immediate availability
• +3 more outcomes

Named customers1 record

Segments1 record

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Minerasia SRLcoreChannel Partner/ Reseller/ DistributorMinerasia SRL appointed as authorized distributor of China Stone's natural gemstone products in Italy. Headquartered in Treviglio, Italy, Minerasia leverages 30 years of sales and marketing experience and distribution capabilities to establish China Stone as a preferred vendor of calibrated precision-cut natural color stones in Italy. The partnership enables Minerasia to expand its gemstone product range and provides China Stone better access to the Italian market.

Scale indicators5 records

Recent moves4 records

Expansion highlights5 records

Broad incumbents

• Swarovski (Gemstones Business): Precision-cut crystal and synthetic gemstones sold B2B to jewelry and watch manufacturers globally. Comparable precision-cutting heritage and B2B trade model, but synthetic rather than natural stone focus.
• Gemfields Group Ltd: Leading colored gemstone miner and marketer (emeralds, rubies, amethysts) with proprietary cutting facilities. Comparable vertical integration and gemstone supply focus, though larger scale and publicly listed.
• Rio Tinto Diamonds: Major diamond miner and marketer with proprietary cutting and branding (Argyle Pink Diamonds). Comparable mine-to-customer vertical integration and luxury-jewelry channel focus, though operating primarily in diamonds.

Direct peers

• Columbia Gem House: Wholesale supplier of responsibly sourced colored gemstones to jewelry designers and manufacturers. Comparable trade-channel B2B model with mine-to-cutter vertical integration and focus on calibrated melee.
• Crystalix: Manufacturer of precision-cut calibrated gemstones serving jewelry manufacturers. Comparable focus on tight tolerances, calibrated sizing, and B2B supply to watch and jewelry brands.
• Leibish & Co. Specialist in natural fancy colored sapphires, rubies, and emeralds supplying jewelry trade and retail. Comparable product mix in calibrated natural colored gemstones with overlapping customer base among luxury brands.
• Stuller, Inc. US-based wholesale supplier of jewelry findings, melee diamonds, and colored gemstones to 40,000+ jewelry professionals. Directly comparable B2B trade-only distribution model serving fine jewelry manufacturers with calibrated gemstone inputs.
• Fuli Gemstones: Chinese-origin producer of precision-cut natural colored gemstones, including the world's largest faceted tsavorite. Closest direct competitor in the calibrated melee category with similar Asia-based manufacturing footprint.

Regional players

• Gems Trade (Thailand): Thailand-based wholesale dealer of calibrated colored gemstones to jewelry manufacturers. Overlapping Bangkok-centric supply chain and similar product categories (ruby, sapphire melee).

Others

• Gemological Institute of America (GIA): Industry standards body for gemstone grading and certification. China Stone relies on GIA-equivalent traceability expectations from its brand customers; GIA's standards shape what 'calibrated' means in the industry.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/thechinastone
• Facebookfacebook.com/thechinastone
• LinkedInlinkedin.com/company/china-stone-co.-ltd
• Pinterestpinterest.com/precisiongems

Compliance5 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 China Stone