Dosing, storage & the stone's role
Five things that follow from putting the evaporation somewhere else.
In an aroma stone system, oil is dripped onto a porous ceramic or gypsum piece and evaporates from its large surface area. The bottle never diffuses anything. It stores the oil away from light and air, and it delivers a counted number of drops onto the stone, which makes the orifice reducer the functional heart of the pack.
The stone provides the surface area, not the bottle
A porous stone has an internal surface many times its external size, which is why a few drops scent a room while the same drops in a dish would not. The bottle contributes nothing to that. Understanding the division stops effort being spent on bottle features that cannot affect performance in any way.
The orifice reducer is the dosing instrument
Because the dose is counted in drops onto a stone, drop consistency is the whole user experience. Reducer bore, oil viscosity and temperature set the drop size, and a customer who gets six drops where they expected three has over-scented a room they cannot un-scent. It is worth specifying the reducer as carefully as the oil.
The oil is usually neat, so the closure must suit it
Aroma stone systems generally use undiluted or lightly diluted fragrance and essential oils, which attack ordinary liners. PTFE-faced liners or cone liners are the appropriate specification, and a liner chosen for a diluted room spray will not survive the same fragrance in its neat form for a shelf life.
Stones saturate and need replacing eventually
A porous stone accumulates residue and previous fragrances, so it eventually holds less and can muddle a new scent. Selling replacement stones alongside refills, and saying when to change them, prevents a customer concluding that the oil has weakened when the stone is what has stopped working.
Refill is the business model
The stone is durable and the oil is consumed, so the recurring purchase is the bottle. That makes fill size, price per bottle and how obviously it identifies as the right refill the commercial questions, and it makes the glass itself a minor line item — much as it is in any other refill-driven fragrance format.
The stone and the bottle are sold together and wear out apart
A porous stone reaches saturation long before the customer finishes buying oil, so the pack has to make replacement stones easy to find and obvious to need. Selling the vessel as a permanent object and the stone as a consumable is the honest structure, and it is what keeps the product working after the first bottle.
