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Halle has kept pretty mum about her engagement to French actor Olivier Martinez, but she’s not shy about showing off her one-of-a-kind stone!

Halle Berry and beau Olivier Martinez got engaged over the holidays, and we haven’t heard too much about their wedding plans just yet — but HollywoodLife.com has all the details about her $100,000 ring!

Jewelry experts at Anter Diamonds & Fine Jewelry in NYC told HollywoodLife.com Halle’s rock could be worth upwards of six figures!

“If it’s the cleanest emerald, it could be worth up to $100,000 — maybe more,” our expert told us about the four carat bling. “It looks like an emerald on 18kt gold setting. The band could be white gold or platinum.”

The custom-designed etching on the ring is likely filigree — a popular request that makes an engagement ring truly one-of-a-kind.

“The symbols could be something special to them, which gives it a little bit of an antique, art-deco look,” the jeweler says.

As for Olivier’s unique choice of an emerald over a diamond, colored stones aren’t as rare as you might think.

“Princess Diana’s is a sapphire, and celebrities always want to do something different,” our source says, adding that emerald is not unheard of for engagement rings, even among non-celebs!

Halle’s birthstone is peridot, also a green stone, so there may be some significance there — and there’s a good chance her sparkler came from Colombia.

“That’s where emeralds come from,” says our source. ”Or at least good ones do.”

What do YOU think, HollywoodLifers? Is Halle Berry’s extra-special ring a sign of true love?

– Kaydi Poirier

More Halle Berry

1. Halle Berry Cancels Her Oscar Appearance For Daughter Nahla
2. Oscars Best Dressed 2011
3. Halle Berry & Olivier Martinez Are Engaged — Congratulations