How to add gem sparkle effect?

[Tykvesh]

I use this:

local function Sparkle(inst, colour)
    if not inst.AnimState:IsCurrentAnimation(colour.."gem_sparkle") then
        inst.AnimState:PlayAnimation(colour.."gem_sparkle")
        inst.AnimState:PushAnimation(colour.."gem_idle", false)
    end
    inst:DoTaskInTime(4 + math.random(), Sparkle, colour)
end

inst:DoTaskInTime(0, Sparkle, colour)

but my item texture disappears when on the ground :\

[Lumina]

I guess it's because your item don't have a matching animation. As far as i know, you can't just add the sparkle effect this way.