This plant stays outdoors and gets afternoon sun couple hours. I water it once a week.
What is happening to the ends?
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Jade plant is susceptible to sunburn. If you take it out doors and plop it in full sun, you'll get something that looks like you have. The plants usually recover by putting out new leaves with chloroplasts/thylakoids arranged so as not to capture too much energy. Sun angle is changing rapidly this time of year, before spring solstice, so you may be getting a lot more sun in the usual spot than you expect.
My jade, not gollum, has this as well, I think. If your jade were babied and lived in a green house it probably would be more...pristine. Having to deal with the weather, seriously hot to below freezing would account for this guy's 'scars'. The tips would be damaged first by the cold or heat. Not a disease, not insects, more in the category of mechanical damage from being out of doors and surviving extreme temperatures. I would most definitely give it a little fertilizer. Go get a small bottle of OSMOCOTE granules/beads; 14-14-14. Use only once per year according to their directions but don't give every 3 months! Your watering sounds just fine especially since this plant is out doors. I'd use bottled water, distilled water not the tap water. And looking a bit closer, I think he will love some fertilizer. Looks great for getting along with nothing but the soil you gave him. But tis time. See the spots and uneven color...a bit too light of a green and transparent. The plant behind him is in need as well, those purplish reddish margins show lack of phosphorus or magnesium. Don't use epsom salts, trust me. It does add magnesium sulfate but doesn't really do much for plants. That is the most recent FAD these days.