Short answer: The South African dōTERRA listing gives the Brevi Stone Diffuser dimensions as 128 mm × 77 mm (12.8 cm × 7.7 cm). It does not label the axes. Match your model and measure the unit before deciding which number is height or diameter, or planning an operating space.

Identify the Brevi unit first

Photograph the base, label, controls, power adapter, packaging, and manual. Record the brand, Brevi finish, item or model number, serial or production mark if present, purchase market, product bundle, and date of the document. “Brevi” may identify a product family while a regional listing or bundle identifies a particular item. A walnut, stone, or marble finish can share a design without proving that every component or measurement is identical.

Keep the unit separate from a similar-looking diffuser. Record button labels, light behavior, reservoir opening, cord position, power rating, automatic shutoff, and any supplied cup or cover. These details help match the physical object to the right manual. A retailer photo, marketplace description, or remembered shape is a lead, not a controlled specification.

Read a dimension line precisely

When a product page says 128 mm × 77 mm, preserve the wording exactly and note the source, market, item number, access date, and whether the line describes the body, base, package, or another component. Do not add a third dimension by guessing. Do not turn a diameter into a width and depth, or a package measurement into the clearance needed for the operating unit.

Use the same units and a consistent method. For a physical check, define height from the supporting surface to the highest fixed point; width and depth from the widest body points; and diameter only when the body is actually circular in the measured plane. Remove detachable packaging but do not remove a fixed cover. Photograph the ruler or caliper reading and record who measured it.

Check reservoir and placement separately

External dimensions do not establish water capacity, mist coverage, runtime, or safe clearance. Record the reservoir capacity only from a manual or product document that names the same model, and keep maximum fill, minimum water, run mode, and low-water shutoff as separate fields. A room-size statement is a marketing or product-use description; it is not a promise for every room, oil, ceiling, airflow pattern, or user.

For placement, measure the shelf or table, cord path, overhead clearance, wall distance, spill area, and access to the controls. Check the manual for water, electrical, cleaning, and surface instructions. Never wedge the diffuser into a cubby because the body fits on paper. The operating space, vapor path, heat, moisture, and ability to unplug matter as much as the shell dimensions.

Compare regional records

Regional product pages and product-information PDFs can differ in item number, language, bundle, availability, run mode, room statement, or caution text. Treat each as a dated source. A South African shop page, a United States bundle sheet, and a Canadian bundle sheet may describe related products without proving that a reader's unit has the same revision. Save the document and reconcile differences with the manual or manufacturer support.

If your unit has no readable model label or differs from the listing, use your measurements and ask the manufacturer to identify it. Preserve the two-number listing as published rather than inventing a third dimension or assigning height and diameter from a photograph.

Dimension worksheet

FieldRecordDo not infer
IdentityBrand, Brevi finish, item number, market, bundle, manual, and document date.That all Brevi products share one specification.
BodyHeight, width, depth or diameter, method, instrument, fixed parts, and photographs.That 128 mm × 77 mm supplies three axes or their orientation.
ReservoirCapacity, fill line, run mode, low-water behavior, and matching manual.That outside dimensions reveal water capacity or runtime.
PlacementShelf, cord, airflow, wall, spill, overhead, and service clearance.That a unit fits a shelf when it cannot operate there safely.

A shelf-fit example

A shelf may be wider than both published numbers and still be unsuitable for operation. The unit needs the placement, vapor clearance, cord access and maintenance space required by its matching instructions. Check body fit and operating clearance separately; the outside dimensions do not establish water capacity or runtime.