What does old mine cut mean?

It's an early style of faceting used before the twentieth century. These stones feature a high crown and a visible flat facet at the bottom called a culet. They were cut by hand to sparkle under candlelight.

I have this heavy marble table top with lots of different coloured shapes inlaid into it, how do I clean the surface without ruining the polish?

Start with a soft dry cloth to remove loose dust. You'll want to avoid any acidic cleaners because they will etch the marble and dull the finish. If it needs more, use a slightly damp cloth with a diluted mild soap solution. Wipe it dry immediately. Do not let water sit on the joints, as it can loosen the historical cement holding the inlay together.

How to store loose intaglios?

Keep them separated in a padded tray. Hardstones can easily scratch each other if they rattle around loose in a drawer. Wrap individual pieces in acid-free tissue paper if you lack a compartmentalised box. This prevents surface abrasion and protects them from sudden temperature shifts.

My grandmother left me a collection of what looks like polished pebbles but some are carved with faces and crests, is there a way to figure out what they were used for?

Crests usually indicate a seal matrix. These were pressed into hot wax to seal letters and prove the sender's identity. Carved faces are often cameos or intaglios collected during European travels. Many tourists bought them as loose stones and later had them mounted into rings or fobs back home. Some plain polished stones might simply be regional souvenirs. People often collected local agates and had them polished as a record of a trip.

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Antique Stones from the 18th Century

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Antique stones encompass everything from Grand Tour specimen marbles and carved intaglios to old-mine faceted gems, serving historically as both architectural focal points and personal adornments.