On the fifth day of Christmas
My true love got from me
From my Treasure Box of ATCs!
Not everyone has these tools, but it's what I work with on a daily basis. I used one of my pointed pens, dipped in (actually "swiped" with a brush loaded with) gold gouache.
Gouache is a watercolor-like paint in a tube with a little more gravitas than the usual watercolor. I used a Turner® Gold Orange and a Holbein® Brilliant Gold. Both of these tubes of paint (approximately 0.5 ounces each) are a hefty investment . . . each around $20 a tube. I tell you all this because, well, someone is bound to ask!
I have yet to find a gold marker capable of producing this effect. Maybe someone out there in this Zentangle universe has found one. If so, give it up to these passionate tanglers! :-)