Green’s Dictionary of Slang

a dealer in fake ‘gold’ rings.

1663		Wandring Whores Complaint 5: The thirteenth a Fambler, false Rings for to sell, / When a Mob he has bit, his Cole he will tell.
1671		‘L.B.’ New Academy of Complements 205: The thirteenth a Fambler, false Rings for to sell.
1693		Poor Robin in Nares Gloss. (1822) n.p.: A most plentiful crop [...] of hectors, trepanners, gilts, pads, biters, prigs, divers, lifters, filers, bulkers, droppers, famblers, donnakers, cross-biters, kidnappers, vouchers, millikers, pymers, decoys, and shop-lifters, all Newgate-birds, whom the devil prepares ready fitted for Tyburn, ready to drop into the hangman’s mouth [N].
1712		‘Black Procession’ in Farmer Musa Pedestris (1896) 38: The thirteenth a famble, false rings for to sell, / When a mob, he has bit his Cole he will tell.
1725		New Canting Dict. n.p.: famblers a Species of Villains that go up and down selling counterfeit Rings, &c.
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. 1725].
1869		‘Thief-Catcher’s Prophecy’ in W.H. Logan Pedlar’s Pack of Ballads 143: [as cit. 1671].