Hi!
First of all, I just want to tell you that this is a great website! I think I narrowed my mystery eggs down to some type of snail eggs using the info you provided about identifing eggs. I was going to remove a plastic pot from my pond since the plant in it didn't winter over, but when I pulled it up out of the water it had clumps of jelly stuck to it with tiny whie eggs in it. I quickly replaced the pot and now I'm trying to find out if they're something I want more of living in my pond!
Thanks for your help!

If the individual eggs are all grouped under the canopy of the same glob of jelly, and the eggs are in approximately 1/3 of an inch in diameter groups of about 10-30 eggs, then they are snail eggs. If smaller than that, they may be insect eggs. If the individual eggs are truly individual but perhaps next to each other, and each egg is about 1/8 of an inch, then they may be fish eggs. What species of fish do you have?

When eggs turn white it may indicate that they have already hatched or have been attacked by fungus (either they weren't fertile, or they later died).

The eggs are pretty tiny. Each little jelly glob has quite a few eggs, probably 20-30.
I noticed a lot of tiny snails in my pond, not sure how they got there! I added trapdoor snails to my pond, but these smaller ones must have stole away on some of the new plants I added this year. I was thinking that maybe the eggs belong to these tiny dark brown snails. I also noticed these jelly globs on rocks in my pond.
As for my fish, I think they are your average goldfish. I'm just hoping these little tiny snails don't take over the pond, the more I look, the more I find!

Yep, snails. You can't really keep snails from finding your pond. They come in on plants (even if you treat them; I bleached some once and still found live snails but the plants died from it!) or even in on the legs of birds that have visited another pond. In a balanced pond with various kinds of animals and plants, there may be a lot of snails but they usually don't take over. Some of the fish and other animals in my pond eat the snails. The larger snails like the trapdoors that I want, the raccoons keep killing. They pull them out and leave them out of the water, not even bothering to eat their expensive escargot. Trapdoor snails are slow breeders and give birth to live young which is pretty special.