Methodology (summary)
Only breastmilk stones were tested—no metal parts. Samples were continuously immersed as follows: fresh water 6 mo, salt water ≥2 mo, disinfectant ≥2 mo (active substance 70% alcohol), boric acid 5 mo. Photographed on 4 Sept 2025.
Test
| Duration | Material | Result | Recommendation |
|---|---|---|---|
| Fresh water | 6 months | breastmilk stone | ✔︎ Rinse with water after contact and dry. |
| Salt water | ≥ 2 months | breastmilk stone | ⚠︎ Rinse with fresh water and dry; don’t leave salt on the surface. |
| Disinfectant (70% alcohol) | ≥ 2 months | breastmilk stone | ⚠︎ Avoid direct spraying; if it happens—rinse. |
| Boric acid | 5 months | breastmilk stone |
✖︎ Keep away; if contact occurs, rinse immediately. |
Metals were not part of the test; their behavior is covered in the silver care guide.
You can follow the testing process on our Instagram.
Fresh water — 6 months of continuous immersion
By the numbers
Medium: fresh water (room temp) · Duration: 6 mo · Sample: breastmilk stone
Finding
No visible surface changes after 6 months.
Recommendation
Water isn’t a problem for the stone. After contact, rinse with plain water and dry with a soft cloth.
Fresh water, 6 months — no visible changes.
Salt water — ≥2 months of continuous immersion
By the numbers
Medium: salt/sea water · Duration: ≥2 mo · Sample: breastmilk stone
Finding
A salt film was noted; it disappears with rinsing. No permanent changes.
Recommendation
Swimming is fine, but rinse with fresh water right away and dry. Don’t let salt sit. Salt can oxidize silver!
Salt water, ≥2 months — salt film removed by rinsing.
Disinfectant — ≥2 months of continuous immersion
By the numbers
Product: Tinktura
Active substance: 70% alcohol
INCI: Alcohol, Aqua, Propylene Glycol, PEG/PPG-8/3 Laurate, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Mentha Piperita Oil, Aminomethyl Propanol
Duration: ≥2 mo · Sample: breastmilk stone
Finding
Occasional thin film removable by rinsing; no permanent changes to the stone.
Recommendation
In real life this is brief contact. If disinfectant gets on the jewelry, wipe, rinse, and dry. Do not spray directly on the stone.
Disinfectant (70% alcohol), ≥2 months — no permanent changes.
Boric acid — 5 months of continuous immersion
By the numbers
Solution: boric acid 90% · Duration: 5 mo · Sample: breastmilk stone
Finding
Slight dulling of the enamel appeared after ~4 months and remained visible.
Recommendation
Avoid contact with boric acid and similar solutions. If it happens, rinse immediately with plenty of water and dry.
Boric acid, 5 months — slight dulling after 4 months.
Conclusion
These “worst-case” immersions say enough: water doesn’t harm the stone; salt water and disinfectant can leave a film that rinses off; boric acid slightly mattes the surface after about four months. In everyday wear the exposure is shorter and milder, so a simple rinse-and-dry routine keeps things in check.
Tests were done only on the breastmilk stone, without metal parts. For care of silver and gold—see the metal guide. For shower/sea/pool details—see the water guide. If you’re worried about long-term color and shine, read the piece on yellowing of breastmilk jewelry.
In practice — quick rules
-
After water or sweat, rinse with plain water and dry with a soft cloth.
-
After the sea, don’t wait: rinse with fresh water and dry.
-
Don’t spray perfume or disinfectant on the stone; if it happens, rinse.
-
Avoid contact with boric acid and similar solutions.
-
If you notice a change that won’t wash off, get in touch—we handle repairs and give straight advice.
Ksenija
