When you compare lab-grown diamond prices online, the figure on the screen is rarely the figure you pay. A diamond listed by an overseas retailer can look favourable next to an Australian price, until import charges, currency conversion, freight, and insurance are added on arrival. The gap between the advertised number and the landed cost is where a lot of confusion begins. This guide explains, in general terms, how GST and import costs apply to diamonds brought into Australia, why offshore pricing can surprise you at the border, and what it means when a price is described as AU-inclusive.
None of this is formal tax advice. Tax treatment depends on your circumstances and the way a given import is handled, so we keep things general here and point to the principles rather than the fine print.
Why an overseas price is not the price you pay
A diamond advertised on an international site is usually priced for that retailer's home market. By the time the stone reaches your door in Australia, several layers have typically been added:
- Currency conversion from US dollars or another currency into Australian dollars, often at a rate that includes a margin.
- Goods and Services Tax (GST), the broad 10 percent tax that applies to most goods sold into Australia, including imported ones.
- Freight and handling for international courier movement, which for high-value items is rarely a token amount.
- Insurance covering the stone in transit, which a careful buyer would want regardless.
- Customs and processing charges that can apply depending on declared value and how the consignment is cleared.
Each layer is reasonable on its own. The difficulty is that they are often invisible at the point of comparison, so a price that reads as the lower option can land higher once everything is accounted for. The headline number sets an expectation; the border resets it.
How GST applies to diamonds imported into Australia
GST in Australia is broadly 10 percent and applies to most goods and services, including many goods imported for personal use. For lab-grown diamonds, the practical point is simple: a diamond entering the country is generally within the scope of GST, and that 10 percent has to be paid by someone at some stage. The question is whether it is built into the price you saw or added afterwards.
There are two common ways GST is collected on imports, and the difference matters for how predictable your final cost is.
Lower-value goods
For lower-value consignments, GST is generally collected at the point of sale by the overseas retailer or platform, provided they are registered to do so. In that case the tax is included when you check out, and the figure you agree to is closer to the figure you pay. Many international sellers are set up for this, but not all are, and the way each handles it varies.
Higher-value goods
For higher-value consignments, which most loose diamonds and finished pieces will be, GST and any applicable charges are commonly assessed when the goods are cleared into Australia rather than at checkout. This is where buyers are most often caught out: the website took payment for the stone, but the tax and clearance costs arrive separately, sometimes as a request for payment before the courier will release the parcel. The total can be meaningfully higher than the original screen price, and it can arrive with little warning.
The thresholds and mechanics that decide which path applies are administered by the Australian Border Force and the Australian Taxation Office, and they can change over time. The general principle to carry with you is steadier than the detail: a diamond imported into Australia attracts GST one way or another, and an offshore price that looks lower may simply be a price with the tax not yet added.
What about import duty?
Import duty is a separate charge from GST and depends on the classification of the goods and their country of origin. For many categories, duty is modest or does not apply, but it is not something a buyer can assume away, and it is calculated on top of the value used for GST. Combined with freight and clearance handling, duty is one more variable that sits between an advertised offshore figure and the amount that finally clears into your hands.
The honest summary is that the landed cost of an imported diamond is built from several moving parts, and most of them are not shown on the product page you started from. That is not a reason to avoid importing. It is a reason to compare like with like, and to ask what a quoted price actually contains before treating it as the total.
What 'AU-inclusive' pricing really means
AU-inclusive pricing is our response to all of the above. It means the price you see is the price you pay, in Australian dollars, with the elements that would otherwise appear at the border already inside the figure. When we quote an AU-inclusive price, it includes:
- GST, so there is no separate tax to settle before the stone is released.
- Shipping within Australia by insured courier, dispatched from Sydney.
- Insurance covering the diamond in transit, so the risk does not sit with you.
- The certificate, with every stone independently certified by IGI, GIA, or an equivalent laboratory.
The effect is that there is no second invoice and no message from a courier asking for a clearance payment before delivery. The number you agree to at the start is the number that settles the purchase. For a considered acquisition like a diamond, that predictability is part of the value, not a detail.
It also makes genuine comparison possible. An AU-inclusive figure can be set against another AU-inclusive figure with confidence, because both contain the same things. Comparing an AU-inclusive price against a bare offshore listing is comparing a total against a starting point, and the starting point will almost always look lower until the rest arrives.
How our sourced-to-order model fits in
We work to a sourced-to-order model rather than holding a fixed display case of stock. You tell us the cut, carat, and clarity you are after, we source a certified stone that meets it, and we quote the AU-inclusive price for that specific diamond. Because the stone is sourced for your order and dispatched domestically once it is with us, the import considerations are handled before the price reaches you, not afterwards. You can read more about that process on our how we source page, and our shipping policy sets out how insured delivery from Sydney works in practice.
This is the same diamond you would find described on an overseas site, chemically, physically, and optically identical to a mined diamond, with the same kind of independent certification. The difference is in how it reaches you and what the price already covers.
Frequently asked questions
Do I have to pay GST on a lab-grown diamond bought from overseas?
Generally, yes. GST of broadly 10 percent applies to most goods imported into Australia. For lower-value consignments it is often collected by the seller at checkout; for higher-value ones, which most diamonds will be, it is commonly assessed when the goods are cleared into the country. Either way, the tax applies. The variable is whether it is inside the price you saw or added later. This is general information, not tax advice for your situation.
Why is an AU-inclusive price sometimes higher than an overseas listing?
Because it already contains things the overseas listing does not. An AU-inclusive price has GST, insured domestic shipping, transit insurance, and the certificate built in. An offshore listing usually shows the stone alone, before conversion, tax, freight, and clearance. Once those are added to the overseas figure, the comparison often looks different. To compare fairly, set a total against a total.
Will I get a surprise bill from the courier with an AU-inclusive purchase?
No. The point of AU-inclusive pricing is that there is no second invoice. GST and delivery are settled within the original price, and your insured parcel is dispatched from Sydney without a clearance payment standing between you and the stone. The figure you agree to is the figure that completes the purchase.
Does import duty apply to lab-grown diamonds?
Import duty is separate from GST and depends on how the goods are classified and where they originate. For many categories it is modest or does not apply, but it cannot be assumed away, and it is calculated on top of the value used for GST. When you buy from us, these considerations are handled before the price reaches you, so they do not surface as a later charge.
See the collection
If you would rather compare a clear total than reverse-engineer a landed cost, that is the experience we are built around. Every price is AU-inclusive, in Australian dollars, with GST, insured shipping from Sydney, transit insurance, and independent certification already inside the figure. Explore the full collection, or read about how we source each certified stone to order.