BIS diamond rule explained: How India’s new terminology affects buyers and brands

Imagine you’re scrolling through a jewelry app or standing at a counter, staring at two stones that look identical. One carries a price tag that could fund a small wedding, while the other is surprisingly wallet-friendly. The label throws around comforting words like “earth-friendly” or “cultured,” and suddenly, you aren't quite sure what you’re looking at. Are you investing in a rare natural gem, or are you about to buy a lab experiment with a fancy name? It is a dilemma that has baffled Indian buyers for years, but the government has finally decided to step in and clear the air. The confusion between natural diamonds and their lab-grown counterparts has been a massive challenge for the Indian gem industry. To fix this, the Bureau of Indian Standards (BIS) has introduced a new set of terminologies—specifically the standard IS 19469:2025—that strictly defines what can (and definitely cannot) be called a diamond.The "Diamond" Rule Here is the headline of the new regulation: The word "Diamond"—on its own—now belongs exclusively to the natural stuff. Under the new framework, which adopts international ISO standards, a stone can only be labeled as a "Diamond" if it was created by nature. To make it even clearer for you at the jewelry counter, retailers are now officially allowed to use specific prefixes to reassure you. If you see tags reading "real," "natural," "precious," or "genuine," you are looking at a natural stone.What About Lab-Grown? Lab-grown diamonds (LGDs) are a huge market now, but the way they are sold is changing. The BIS wants to ensure that when you buy one, you know exactly what it is. If a jeweler is selling a man-made alternative, they can no longer be vague about it. The new rules mandate that they must use explicit qualifiers. You should see terms like: * Laboratory-created diamond * Lab-grown diamond * Laboratory-grown diamond * LGD * Lab-diamond If a seller tries to get clever and just uses a brand name—let’s say "SparkleMax Stones"—without explicitly adding "laboratory-grown" next to it, that is now considered insufficient disclosure. They have to spell it out for you.The Banned Words This is where it gets interesting for the savvy shopper. To stop sellers from greenwashing or confusing consumers, the BIS has banned certain "feel-good" words for lab-grown stones. You will no longer see lab-grown diamonds marketed as "pure," "natural," "cultured," or even "earth-friendly." The idea is that these words blur the reality of the product's origin. By stripping away these marketing buzzwords, the industry hopes to make the purchase completely transparent.Why This MattersThe logic is simple: when you buy a diamond, you deserve to know what it is—honestly and without needing a degree in gemology to decipher the tag. Major jewelry houses across India have already started welcoming the move. It protects the value of natural diamonds while ensuring that if you do choose lab-grown, you’re doing it with your eyes wide open. So, the next time you’re shopping for a solitaire, check the label. If it doesn't say "natural" or just plain "diamond," take a closer look—because the rules of the game have finally changed in your favor.