Two materials can sit in the same room and feel very different against the skin. Metal and many stones often feel cool at first touch, while wood and amber tend to feel warmer.
The difference comes from heat transfer
A material feels cool when it draws heat from the skin relatively quickly. Metals are especially good at this, which is why they can feel cold even when the room itself is comfortable.
Wood transfers heat more slowly, so it usually feels warmer at the same temperature.
Stone usually feels cool at first
Agate, quartz, turquoise and obsidian all tend to feel cooler than wood or amber when first touched.
The sensation changes as the material warms against the body, but the first impression is part of the wearing experience.
Amber feels different from mineral gems
Amber is light and organic rather than mineral. Its low density and thermal behavior make it feel closer to wood than to dense stone.
That is one reason a large amber element can feel surprisingly gentle despite its visual size.
Surface changes what the skin notices
Polish, carving, facets, grain and porosity affect how much of the material touches the skin at once.
A smooth polished bead feels different from a ridged or carved one even when both are made from the same material.
Warm and cool materials can be used together
Sandalwood beside turquoise, amber beside metal or walnut beside polished agate creates contrast in both appearance and touch.
Mixed-material jewelry becomes more interesting because the hand notices the change as well as the eye.
Temperature is one part of tactility
Weight, edge, texture and movement matter too. A cool stone can still feel soft if the surface is rounded; a warm material can feel sharp if the form is faceted.
Let the materials behave naturally
There is no need to chill or heat jewelry to exaggerate the sensation. Temperature extremes can damage finishes, cord, adhesives and some organic materials.
The ordinary contrast between materials is already noticeable enough.