Good place to buy 5mm calibrated matching stones?

[Jax172]

I've bought some diamond jackets and I'd like to make some colored studs to wear with them too. I need 5mm matching stones.
I'd like to eventually have citrine (my son's birthstone), tanzanite (my other son's birthstone), sapphire and ruby.
Is there a good vendor to buy these from?

 

[chrono]

AJSgems and Multicolour have the most options but you'll have to slog though a ton of pages.

 

[minousbijoux]

I would second Multicolour, and keep an eye on the usual suspect precision cutters like The Gem Trader, AC Stones, Mastercut, Litnon, and others up top that of course I'm forgetting.