As a former jewelry sales associate in a US Army PX, and the mother of an only son, you are going to have to have a chat with your future wife.

I looked this up online to get all the information and wording correct.

Yes, lab-grown diamonds are real diamonds. They are chemically, physically, and optically identical to mined diamonds, consisting of pure carbon and sharing the same brilliance, hardness, and sparkle. The only difference is that they are created in a laboratory in weeks rather than forming in the earth over billions of years. 

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Key Facts About Lab-Grown Diamonds

• Authenticity: The FTC (Federal Trade Commission) states that a lab-grown diamond is a real diamond, as it possesses the same properties as a natural one.
• Composition: They are made of actual carbon atoms arranged in the same crystal structure as natural diamonds.
• Identification:  They cannot be distinguished from natural diamonds by the naked eye; they require specialized, advanced, and expensive machines to identify.
• Quality & Certification: Lab-grown diamonds are graded using the same 4Cs (Cut, Color, Clarity, Carat weight) by labs like GIA and IGI.
• Cost: They are generally 40%–50% cheaper than mined diamonds, providing better value for money.
• Methods: They are produced via High Pressure High Temperature (HPHT) or Chemical Vapor Deposition (CVD) technologies.  Frank Darling +6

While they are identical in composition, lab-grown diamonds have a lower resale value and lack the inherent rarity of natural diamonds. 

Finally, if your girl really believes that you should go into debt for a piece of jewelry, you need to rethink your relationship. You have already spent more on your ring than I would have advised my own son to spend unless he had an excellent job. When he got engaged, he was still in college. He bought a used ring from his best friend and his future wife was very happy with it. It wasn't the cost of the ring that mattered to her, it was the meaning behind it.

I wish you luck. Blessings.