Green’s Dictionary of Slang

graviers n.

also graniers
[perhaps f. Fr. grave, heavy, given that the weight of crooked dice was generally affected in one way or another; however, the OED suggests poss. alternative sp., notably graniers (cited in Thomas Dekker, The Bellman of London, 1608), which offers no obvious origin]

(UK Und.) crooked dice.

[UK]G. Walker Detection of Vyle and Detestable Use of Dice Play in Judges (1926) 41: Light graviers there be, demies, contraries, and of all sorts, forged clean against the apparent vantage, which have special and sundry uses.
[UK]Dekker Belman of London E3: The names of false Dyce. [...] A Bale of Flat Cater-Treas. A Bale of Fullams. A Bale of light Graniers.
[UK] ‘Modern Dict.’ in Sporting Mag. May XVIII 100/1: A bale of light graniers.