Why a CVD diamond maker is not an ordinary SME risk
A lab-grown diamond (LGD) manufacturer looks, on a quick read, like any other small manufacturing startup, and that is precisely the mistake a standard SME package policy makes. The reality is a high-capital, high-value-density operation that a generic package underprices and under-covers.
The geography concentrates the picture. Surat and Mumbai produce over 98% of India's lab-grown diamonds, manufactured mainly through Chemical Vapour Deposition (CVD) technology, with the cluster sitting across Gujarat and Maharashtra. Inside one of these units are two unusual features for an SME: expensive, specialised reactors that grow diamonds over weeks, and a stock of seeds, rough and polished stones whose value per square metre of floor space dwarfs that of an ordinary factory.
Those two features, the machinery and the inventory, are the heart of the risk, and they pull in different directions of cover. The reactors are an engineering and property exposure; the stones are a specie and burglary exposure; and the movement of seeds in and polished out is a marine exposure. A package policy built for a generic workshop addresses none of them at the right level, which is why a broker should treat an LGD manufacturer as a specialist placement from the outset.
The reactors: property and machinery breakdown at the right specification
The CVD reactor is the productive core of the business, and it carries two distinct exposures that need two responses.
The first is property damage to the reactor and the plant around it: fire, and the perils a property policy covers, can destroy not just the machine but the partially grown stones inside it and the production capacity the business depends on. The sum insured here has to reflect the real replacement cost of specialised reactors, not a notional book value, because underinsurance through an undervalued sum insured triggers the average clause and cuts every claim proportionately.
The second is mechanical and electrical failure of the reactor itself, which a property policy does not cover. This is machinery breakdown territory: the breakdown of the reactor's own systems, the high-temperature, high-vacuum, precision-controlled equipment that a CVD process relies on. A breakdown can both damage the machine and ruin a growth cycle in progress.
The stock: specie and burglary for high-value inventory
The inventory of a diamond manufacturer is the exposure a standard policy most badly mishandles, because the value is concentrated, portable and attractive to theft in a way ordinary stock is not.
This is where specie insurance belongs. Specie cover is designed for high-value items such as precious stones, addressing the storage and handling of valuable, portable property in a way a general stock cover does not. Alongside it, burglary cover responds to theft from the premises. For an LGD maker holding seeds, rough and polished diamonds, the sum insured has to track the real, and fluctuating, value of stock on hand, because stock in this business can swing sharply with production cycles and order flow.
The valuation discipline is the recurring theme. A general SME stock cover sized on a rough estimate will be inadequate against a concentrated diamond inventory, and the average clause will then reduce any partial-loss recovery. A broker should establish how stock is valued, how the value moves through the production cycle, and whether the cover keeps pace, rather than fixing a single static sum at inception.
The flows: marine transit for seeds in and polished out
An LGD manufacturer is not a closed box. Material flows in as seeds and flows out as polished stones, and both journeys are an exposure that property and specie cover, fixed to the premises, do not address.
The inbound flow is seed imports. The starting material for CVD growth is carbon or diamond seed, and policy has made that flow easier and larger: the Union Budget removed customs duty on the import of carbon and diamond seeds, making seed imports duty-free, alongside a research grant to promote domestic LGD manufacturing. Cheaper, duty-free seeds mean more seed moving into the cluster, and every consignment in transit is a marine cargo exposure.
The outbound flow is polished exports, and it is substantial. Provisional gross exports of polished lab-grown diamonds grew about 37% to Rs 13,466 crore (about US$1.68 billion) in FY2022-23 per GJEPC data, and schemes such as the Diamond Imprest Authorisation Scheme, introduced in January 2025, which provides duty-free imports for exporters, are built to support this export orientation. High-value polished stones moving to overseas buyers need transit cover that responds to loss or damage in carriage, sized to the value actually in transit.
For a broker, the marine layer is not optional add-on. A business that imports its raw material and exports its finished product carries continuous transit exposure at high value, and a programme that covers the factory but not the journeys leaves the most mobile and exposed part of the value chain bare.
Assembling the programme without leaving gaps
The right programme for a lab-grown diamond startup is a set of specialist covers that fit together, not a single package, and the broker's job is to size each layer to the real values and confirm the layers meet without overlap or gap.
A workable structure looks like this:
- Property cover on the reactors, plant and premises, with sums insured at true replacement cost to keep the average clause from biting.
- Machinery breakdown cover for the internal mechanical and electrical failure of the CVD reactors that a property policy excludes.
- Specie and burglary cover on the seed, rough and polished inventory, sized to the cycle-adjusted value of stock on hand.
- Marine cargo cover on inbound seed imports and outbound polished exports, sized to the value actually in transit.
The connective discipline across all four is valuation. Each layer fails quietly if its sum insured understates the true value, because the average clause then reduces the claim, and in a business where value is this concentrated the gap between a rough estimate and the real figure is large. A broker who sets each sum insured against real, current values, and revisits them as production and order flow change, gives the manufacturer cover that holds when it is tested.
Doing this well depends on the detail of the wordings, how a specie policy defines covered property and storage conditions, where a machinery breakdown policy draws the line against property cover, and how a marine cover treats high-value stones in transit. Sarvada gives commercial insurance brokers structured, searchable access to insurer policy wordings and the intelligence around them, so a lab-grown diamond programme can be built on what each specialist policy actually covers. Request Access to place CVD-manufacturer risks with that wording detail to hand.