Pictured: Colorful Gemstone Delight Ring

The October birthstone is Opal, a iridescent stone associated with hope, creativity, and imagination. It rates 5.5 to 6.5 on the Mohs hardness scale, which is the number that actually decides whether you can wear it every day.

What Opal means

Opal has long been linked to hope, creativity, and imagination. October offers opal and tourmaline. Opal contains water and can craze or crack if it dries out, so tourmaline is the more practical choice for a piece worn constantly.

October birthstone at a glance

Featured piece Colorful Gemstone Delight Ring Waterproof, tarnish free, and hypoallergenic. Built on 18K gold plated surgical stainless steel. Shop this piece →

Buying October birthstone jewelry at Costco and other warehouse clubs

Costco does sell genuine fine jewelry, including birthstone pieces, and its pricing is usually competitive because margins are thin and volume is high. Diamonds are commonly certified, and the return policy is unusually generous. Those are real advantages if you are buying a significant piece.

The trade-offs are equally real. Selection is limited and rotates with stock rather than being a permanent catalogue, so a specific Opal piece may or may not be there when you look, and a membership is required. Timing matters too: October sits just before holiday buying starts in earnest, usually the last calm window of the year.

What actually matters for a piece you wear daily

At 5.5 to 6.5 on the Mohs scale, Opal needs more care than most people expect, and is far better suited to earrings or a pendant than a ring that takes daily impact. Never ultrasonic clean opal. Avoid heat and very dry air.

The other half of the equation is the metal. A genuine stone set into plated brass will outlive its setting: the plating wears, the base reacts with skin, and you end up with a good stone in a piece you have stopped wearing. Whatever stone you choose, the setting decides how long you actually wear it.

The everyday alternative

If what you want is the colour and the meaning rather than the carat weight, look for iridescent and shell-toned pieces, which catch light the way opal does set on a non reactive base. Same look, none of the fragility or the price. That standard is what Ezra Gems is built around: hypoallergenic, waterproof, tarnish-free pieces designed for women who put jewelry on and forget about it. Nothing needs removing before a shower, and nothing tarnishes underneath.

Where That Leaves You

October is Opal: iridescent, 5.5 to 6.5 on the Mohs scale, and linked to hope, creativity, and imagination. Buy the stone for the meaning, but judge the setting on whether it will survive being worn. Shop Birthstone Jewelry.

Keep Reading

• September Birthstone: Sapphire Meaning, and Where to Buy It
• August Birthstone: Peridot Meaning, and Where to Buy It
• July Birthstone: Ruby Meaning, and Where to Buy It

Frequently Asked Questions

What is the October birthstone?

The October birthstone is Opal.

Can you wear Opal every day?

It depends on hardness. Check the Mohs rating in the table above: stones at 7.5 and higher handle daily rings well, softer stones are better in earrings or pendants where they take fewer knocks.

Is Costco a good place to buy birthstone jewelry?

Costco sells genuine fine jewelry at competitive prices with a generous return policy, which suits milestone purchases. Selection is limited and rotates, and a membership is required, so it is less useful for a specific piece you want on demand.

Is Ezra Gems jewelry really waterproof?

Yes. Every piece is 18K gold plated over surgical stainless steel, a non reactive base that does not corrode in water, chlorine, or salt. You can shower, swim, sweat, and sleep in it.

Will it turn my skin green?

No. There is no copper or brass touching your skin, only surgical stainless steel under the gold plating, so it will not leave green marks or discoloration.

Is it hypoallergenic and nickel free?

Yes. Every piece is nickel free and free of lead and cadmium, made for sensitive skin and ears that react to ordinary gold tone jewelry.

For limited release designs before they sell out, Exclusive Drops is where the newest pieces land first. To shop the pieces in this guide, browse Birthstone Jewelry.