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Take your stone to a local jeweler and ask the jeweler to verify that the diamond is a real diamond. The jeweler will use a device that measures electricity as it passes through the stone.
The jeweler will charge a small nominal fee to reattach the stone back on your bracelet, unless they sold it to you.
You might be able to pry the stone out of the setting. A better idea would be to take the ring to a jeweler and ask the jeweler to remove the stone in a way that will best preserve the setting.
A diamond is 'worth' what someone will pay you for it. Take your stone to a jeweler and ask the jeweler to buy it. Then ask the jeweler to show you a comparable stone and ask how much it would cost you to purchase the stone. In the grande scheme, any diamond is valued by its cut, colour, clarity and carat weight.
Your local jeweler can help you determine whether or not the crystal coloured stone you have is a diamond or not.
Take your stone to a local jeweler, who can use a probe to confirm that the stone is either a diamond, or not a diamond.
You can test it wouth a touch stone.
Take the stone to a jeweler who can use a probe to determine whether the stone is a diamond or not.
Take your diamond to a jeweler who can test the stone to confirm that it is or is not a diamond.
Take your diamond to a local jeweler whom you trust, and work with the jeweler to set the stone in the metal. The jeweler will charge you for workmanship and for raw materials required to accomplish the finished product that you commission.
Take the raw stone to a jeweler who can apply a probe to the stone to determine whether or not it could be an uncut diamond.
Using a diamond probe, a jeweler can help you determine whether or not the stone you have is a diamond.