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Opals are the superior stone and they actually look awsome. Transparent glass like stones are so boring. They are also much cheaper and not harvested with child labor.
Opals are soft as hell. Not really a diamond replacement.
I'm not talking about replacing your diamond drill bit with opal. I mean jewellery
Rings, like engagement/wedding rings, can take quite a beating. You need a hard stone or it won't really last very long.
I have a lab Ruby in my engagement ring and then lab diamonds around it. The lab Ruby is a good alternative because it's a hard stone! Sapphires and alexandrite are also just as hard and could be good stones in a ring you'd wear everyday.
This is what we did. I got my wife a nice ice blue sapphire center stone instead of a diamond. It was less expensive, durable and more unique.
My engagement ring used sapphire. Beautiful stone.
It's more dropping or getting scratched, but I'll admit I've never seen opal break.
Why does harness matter? You are supposed to wear them, not cut or drill with them.
Hardness absolutely matters in rings. Not as much in pendants or earrings, but people don't realize how rough they are with their hands. Most people do not take their rings off to wash their hands, or do their laundry, or, or, or. So many things have unexpected abrasives that may just feel a little rough on your skin, but can significantly damage a soft stone like opal. In a rush and accidentally bang your hand against the door frame? Chipped opal. Back of your hand itches, so you rub it against your jeans briefly? Scratched opal. They're very fragile stones.
An engagement ring is worn on your hand pretty much all the time. Opals are easily damaged, diamonds are exceptionally durable.
Moissanite
Dont opals lose their shine or something over time due to being hydrophilic?
Hematite. The most metal gemstone.