Intaglio - means a design incised or engraved into a material, in this case a charming incised design of flowers in to crystal, which has then been reversed painted.  The piece attached to the crystal is unmarked white metal that could possible be silver.  The fine twisted chain is 925 marked silver.  This needs to be twisted when putting on to show the design to its best.

I have taken many pictures to show design and condition.  There is a mark just below the attachment holding the crystal not sure if this is design or from the original manufacture when the hole was drilled.  The pendant has always been like this. Nothing has chipped out here, does feel like a scratch but too precise to be one.

Will come in a black velveteen pouch.