Short answer: PT950 is 95% platinum: heavy, naturally white, never tarnishes and holds a diamond securely for decades. S925 is 92.5% silver: light, bright and far less expensive, but it tarnishes and is soft enough that prongs and edges wear with daily use. For a diamond you will wear every day, choose PT950; for a piece worn now and then, or when budget leads, S925 is a sensible choice.
On a product page the two look almost the same: both are white, both are shown with the same diamond. The difference shows up after months of wear. This guide compares them point by point. If you are not sure what the letters and numbers mean, start with jewelry stamps explained.
Side by side
| PT950 platinum | S925 sterling silver | |
|---|---|---|
| Precious metal content | 95% platinum | 92.5% silver |
| Weight for the same design | About twice as heavy | Light |
| Colour | Cool grey-white, naturally | Bright white |
| Tarnish | Does not tarnish | Darkens over time; polishes back |
| Scratches | Metal is pushed aside, not lost: a soft patina forms | Scratches and wears faster |
| Holding a diamond | Very secure; prongs stay strong for years | Softer; prongs need checking more often |
| Skin sensitivity | Among the least reactive metals | Well tolerated by most people; can mark some skin |
| Price (same Aetheris design) | A little below 18K gold | A little over half of 18K gold |
Weight and feel
Platinum is one of the densest metals used in jewelry — roughly twice as dense as silver — so the same ring in PT950 feels noticeably heavier on the hand. Some people love that substance; others prefer the lightness of silver, especially for large earrings.
Colour and tarnish
Both metals are white, but differently. Platinum has a slightly cooler, greyer white and stays that way: it does not tarnish and has no plating to wear through. Sterling silver starts a brighter white, but the copper in its alloy reacts with sulphur in the air and the surface darkens over weeks or months, faster in humid climates. It cleans off easily with a silver cloth — see sterling silver care.
Strength around a diamond
This is the difference that matters most for diamond jewelry. Prongs and bezels are thin, and they take every knock the piece takes. Platinum is dense and tough: when it is scratched, the metal is moved rather than removed, which is why a platinum ring develops a soft patina instead of thinning. Sterling silver is much softer, so edges round off and prongs can thin or bend over years of daily wear. A silver setting is perfectly sound, but it should be checked more often, especially on a ring.
Where the setting sits matters too. Earrings and pendants take far fewer knocks than a ring on your hand, so S925 is a much safer choice for stud earrings or a solitaire pendant than for a ring worn every day.
Comfort for sensitive skin
Platinum is one of the least reactive metals there is, which makes PT950 a common choice for people with sensitive skin. Sterling silver is well tolerated by most people, though the copper in it can leave a faint dark mark on some skin, especially in heat and humidity.
Price
Silver costs a small fraction of platinum by weight, and the gap shows in the price. In our own price list at the time of writing (September 2026), the same design in S925 costs a little over half of the 18K gold version, while PT950 costs slightly less than 18K gold. The diamond is the same in all three; the metal is what changes.
Which should you choose?
- A ring you will wear every day, especially an engagement ring: PT950 (or 18K gold). Browse solitaire rings.
- Earrings, a pendant, or a piece for occasional wear: S925 is a sound, lower-cost choice.
- Sensitive skin: PT950.
- You want the lightest piece: S925.
- You want warmth rather than white: neither — look at yellow or rose 18K gold.
Every Aetheris design can be made in PT950, S925 or 18K gold; the metal is chosen on the product page, and each piece is made to order in 10 working days. The full three-way comparison is in 18K gold, platinum or sterling silver.
Frequently asked questions
Is PT950 worth it over S925?
For a ring worn daily, usually yes: it will not tarnish, keeps the diamond secure and needs less upkeep. For earrings or occasional pieces, S925 gives the same look for much less.
Can S925 hold a lab-grown diamond safely?
Yes, for normal wear. Silver prongs are softer, so have a ring's setting checked once a year and avoid knocking it against hard surfaces.
Does PT950 scratch?
Yes, like every metal. On platinum the metal is displaced rather than lost, forming a satin patina that can be polished back to a shine.
Is PT950 the same as white gold?
No. PT950 is 95% platinum and naturally white. White gold is an alloy of gold with white metals, usually finished with a rhodium layer that is renewed over time.