Why jewelry sustainability claims should be assessed through methodology, disclosure, and verified evidence
Hong Kong | SJC Insights
In global discussions about jewelry sustainability, certain assumptions often appear before the data does.
One common example is the belief that products manufactured in a particular country must automatically carry a certain carbon profile. In the case of lab-grown diamonds and jewelry supply chains, some industry discussions still assume that because many lab-grown diamonds are produced in China, their carbon footprint must be high due to China’s historical reliance on coal-powered electricity.
This concern deserves to be discussed seriously.
However, sustainability should not be judged by country labels alone.
A responsible carbon discussion must be based on facility-level data, energy sources, production methods, system boundaries, traceability records, and transparent methodology. Without these elements, broad assumptions can easily become misleading.
From country-based assumptions to data-based assessment
A product’s carbon footprint is not determined simply by where it is made.
It is shaped by many measurable factors, including:
the energy source used in production;
the efficiency of the manufacturing process;
the type of raw materials and inputs;
the production yield and material loss;
the transportation route and distance;
the carbon accounting boundary;
the methodology used for calculation;
the quality of data collection and verification.
For this reason, statements such as “made in China,” “made in India,” “made in Europe,” or “made in the United States” should not be treated as carbon data.
They may provide geographic context, but they do not replace product-level or facility-level evidence.
At SJC, we believe that the future of jewelry sustainability must move from assumption to evidence.
China’s energy transition should be understood with greater accuracy
It is true that China’s electricity system has historically relied heavily on coal.
It is also true that China has become one of the world’s most significant markets for renewable energy development, including solar, wind, hydro, and energy storage infrastructure.
Both facts can exist at the same time.
For the jewelry industry, the question should not be whether China as a whole can be described with one simple label. The better question is whether a specific supplier, factory, or production batch can disclose reliable data about its energy use, process efficiency, and carbon calculation method.
Some manufacturers in China and other developing markets are already investing in:
renewable electricity procurement;
on-site solar energy;
energy efficiency improvement;
digital production tracking;
supply chain traceability;
process-level carbon accounting.
These efforts should be assessed through data, not stereotypes.
Developing-market suppliers need a fair voice in sustainability discussions
Many jewelry supply chain companies in developing markets play an important role in global manufacturing.
They cut, polish, grow, cast, refine, set, assemble, and supply products for brands and retailers around the world. Yet in many sustainability conversations, these companies are often discussed as risk factors rather than recognized as participants in the transition.
This creates an imbalance.
Sustainability should not become a new language of exclusion.
It should be a shared framework that allows suppliers from different regions to disclose progress, improve performance, and participate in global standards discussions on fair and transparent terms.
For SJC, this is an important part of our mission.
We believe developing-market suppliers should not be judged only by outdated regional assumptions. They should be encouraged to provide better data, clearer methodology, and stronger transparency.
The jewelry industry needs higher standards, but it also needs a fairer conversation.
Natural and lab-grown diamonds both need comparable carbon disclosure
The discussion around carbon footprint should not become a simple debate between natural diamonds and lab-grown diamonds.
Both sectors have environmental impacts.
Both sectors can improve.
Both sectors may benefit from renewable energy, better technology, operational efficiency, and stronger supply chain governance.
The key question is not which category can make a better marketing claim.
The key question is whether claims from both sides are measured, disclosed, and comparable.
A credible carbon claim should clearly explain:
what is being measured;
which stages of the supply chain are included;
which emissions scopes are covered;
what data sources are used;
what assumptions are applied;
whether the result has been reviewed or verified.
Without comparable boundaries, carbon claims may create confusion rather than transparency.
Why SJC supports data-based sustainability
SJC does not defend any country, company, or product category.
SJC supports data-based sustainability.
This means that any sustainability claim in the jewelry industry should be supported by:
methodology — a clear calculation framework;
disclosure — transparent reporting of data, assumptions, and boundaries;
traceability — the ability to connect products to supply chain information;
verification — review by qualified and independent parties where appropriate.
This is the foundation of SJC’s work on carbon transparency and responsible development across the jewelry value chain.
Our role is not to replace existing gemological standards, nor to act as a direct emissions auditor.
Our role is to help build a practical and transparent framework that encourages better disclosure, better data, and better industry dialogue.
From assumption to evidence
The jewelry industry is entering a new stage of sustainability communication.
In the past, many claims were built around broad narratives: natural versus lab-grown, developed markets versus developing markets, local versus global, traditional versus modern.
The next stage must be more disciplined.
Sustainability claims should be measured, not assumed.
Country labels are not carbon data.
A product made in any region should be assessed by the same principles: methodology, disclosure, traceability, and verified evidence.
Only then can the jewelry industry move beyond stereotypes and build a more credible, inclusive, and transparent sustainability future.
About SJC
The Sustainable Jewelry Council (SJC) is an independent industry initiative dedicated to advancing sustainability, transparency, and responsible development across the global jewelry value chain.
SJC works to support practical sustainability frameworks, carbon transparency, responsible sourcing dialogue, and industry collaboration across diamonds, gemstones, precious metals, and finished jewelry products.
Sustainable Jewelry Council
Building a transparent and practical sustainability framework for the global jewelry industry.
