What to Ask Before Buying Lab Grown Diamond Jewellery in India

I’ve watched a lot of people walk into a showroom and just trust whatever the salesperson tells them, because asking questions feels a little awkward when you’re standing there excited about a ring.

Genuinely, don’t feel that way. This market has grown fast over the last couple of years, and the gap between a transparent jeweller and one banking on you not asking questions can be significant.

Here’s what I’d actually tell a friend to ask before they buy anywhere, us included.

Ask To See The Laser Inscription Match The Certificate

A certificate is only worth something if it belongs to the exact diamond in front of you.

Every properly graded stone has a tiny registry number laser inscribed onto its girdle, invisible to the eye but visible under a loupe or a digital microscope.

Ask the jeweller to show it to you and confirm it matches the certificate number exactly.

If a jeweller hesitates, or waves it off as unnecessary, that’s worth paying attention to. It should be a completely ordinary request, and any good jeweller will pull out the microscope without blinking.

Ask About The Growth Method, Mostly Just To Know

Ask whether the stone is CVD or HPHT.

Honestly, this rarely changes anything about how the diamond looks once it’s cut and polished, but it’s worth knowing, and a transparent jeweller will tell you without hesitation.

If it’s HPHT, it’s worth glancing at the stone in natural daylight, some HPHT stones can carry a very faint blue undertone from trace boron, subtle enough that it doesn’t usually show on a certificate.

If it’s CVD, you might see a note about post growth treatment, which just means the colour was permanently corrected through heat and pressure.

Neither of these is a red flag on its own, they’re just details worth understanding rather than being surprised by later.

Ask For A Bill That Actually Separates Everything

This is genuinely one of the most important questions, and the one people skip most often. A single lump sum price on a quote makes it impossible to know what you’re actually paying for.

Ask for an itemised bill that separates the gold value, based on the day’s rate and the exact weight, the centre diamond cost, any accent or melee diamond cost, and the making charges as their own line.

If a jeweller resists breaking this down, or gives you a vague answer, that’s usually a sign the margins are hidden somewhere in the bundle.

At ROOMY’S JEWELLERY, we itemise every bill this way by default, not because someone asked, but because we think you should see exactly what you’re paying for.

Ask Whether It’s Ideal Cut, Not Just Excellent

For a round diamond specifically, don’t settle for “Excellent” without asking if it’s actually “Ideal.”

Cut grade genuinely affects how a diamond performs under light more than almost any other factor, and because lab grown rough is engineered rather than mined, there’s very little reason a well made round stone should sit below Ideal.

If a jeweller can’t tell you the cut grade clearly, or seems unsure, ask to see it written on the certificate itself rather than taking their word for it.

Ask For The Exact Buy-Back Or Exchange Terms, In Writing

We’ve written a full piece on this specifically, because it deserves proper attention, but the short version, ask exactly what any advertised buy-back percentage applies to, whether it’s limited to an upgrade only, and get it documented on your actual invoice rather than a verbal promise.

A guarantee that isn’t written down isn’t really a guarantee.

Why This Isn’t Being Difficult

None of these questions are confrontational. A jeweller who’s genuinely transparent about their sourcing, their certification, and their pricing will answer all five without a second thought, often before you even ask.

If someone gets defensive, or tries to redirect you with pure sentiment instead of specifics, that tells you something worth knowing before you spend real money, not after.