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Usually, gems are tightly embedded in a black matrix. You might be able to have veins of gold glimmer in the lakebed, but the gemstones should sparkle from the cave wall. Or use fluorescent minerals, which glow under backlight in vivid neon colors.
Gemstones are like glass and can cut you deeply. Probably would not something you want to walk on or lean against.
When I hunt gems in water, they don't gleam or anything. They are mud clumps. You dig out the shovels full of mud, then start washing it away, breaking up the mud clumps, until it dissolves and washes away, hopefully leaving behind something shiny.
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