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- In intaglio gems at least, the recessed cut surface is usually very well preserved, and microscopic examination is revealing of the technique used.
- The Lothair Crystal ( or " Suzanna Crystal ", British Museum, 11.5 cm diameter ), clearly not designed for use as a seal, is the best known of 20 surviving Carolingian large intaglio gems with complex figural scenes, although most were used for seals.