The ornamental design for gel candle, as shown and described.
FIG. 1 is a top perspective view of a gel candle showing my new design, wherein coffee beans are disposed on at least a portion of the bottom of a votive vessel.
FIG. 2 is a top perspective view thereof.
FIG. 3 is a bottom perspective view thereof.
FIG. 4 is a front perspective view thereof.
FIG. 5 is a rear perspective view thereof.
FIG. 6 is a left side perspective view thereof; and,
FIG. 7 is a right side perspective view thereof.
The single dashed lines represent outer portions of a gel candle, an inner vessel and a wick and form no part of the claim.
The characteristic feature of the design resides with the gel candle having materials embedded therein.