My dictionary gives "small disc" as the translation for girello, so if you don't have any more context you could use that.

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Note added at 2003-01-16 07:43:51 (GMT)
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Forgot the reference: Il Nuovo Diz. Hazin Garzanti

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Note added at 2003-01-16 07:44:51 (GMT)
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Perhaps its one of those buckles formed by interlocking rings fastened to each end of the belt. A picture would help, though!

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Note added at 2003-01-16 07:48:28 (GMT)
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Try this link, with photo, it may be something similar to your belt:

http://shopping.yahoo.com/shop?d=product&id=61110.prod589050...

(\"Suzi Roher Gold Oval Ring Belt
Hip slung style with brushed gold metal rings. In black leather with brushed gold oval rings. Larger oval in front holds hook closure.\")

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Note added at 2003-01-16 07:49:26 (GMT)
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Sorry, the dictionary is of course Il Nuovo Diz. Hazon Garzanti - I\'ve worn the vowels off my keyboard, so sometimes I type i instead of o!