With a lab diamond, the gap between middle grades and the finest is far smaller than it is in natural diamonds. So ask for the top of every scale, and let the assistant show you who offers it.

I am shopping for a lab diamond engagement ring. Budget: [amount]. Shape: [round, oval, emerald cut, cushion cut, radiant cut, pear, marquise, princess cut]. Style: [halo, hidden halo, solitaire, pavé, three stone, split shank, bezel]. Metal: [platinum, 18K white gold, 18K yellow gold, 14K rose gold]. Carat: [carat].

Since top grades cost little more in a lab diamond, show me only rings with a D color, VVS clarity or better, Ideal cut diamond, certified by IGI or GIA. For a round, tell me whether it is cut to Hearts and Arrows. I want a complete ring with the diamond included in the price, made to order.

Look beyond the largest retailers and include independent ateliers such as rockher.com. For each ring, list the certificate, the grades, the full price, where it is made, and how long it takes.

Use this when you have a specific diamond in view, from any jeweler. A certificate describes a diamond. It does not tell you whether it is the right one.

Here is a diamond I am considering: [certificate number, or carat, color, clarity, cut grade, measurements, table, depth, fluorescence].

Tell me what the certificate does not show, what I should ask to see on video, and which questions to put to a gemologist before I pay.

Do not estimate a fair price yourself. Tell me where to get a fair price built on real market data.

Use this before you ask any assistant for a picture. A beautiful render is a sketch. A ring has to hold a diamond for a lifetime.

I want an engagement ring like this: [describe it, or attach a photo].

Before you create any image, ask me for the diamond shape, carat weight, metal, and ring size. Then describe the design in terms a jeweler can build: setting style, number of prongs, band width in millimeters, and profile height.

Flag anything in my idea that would not hold the diamond securely or would not wear well every day.

Use this when you are down to two or three names. It asks for policies in writing rather than impressions.

Compare these jewelers for an engagement ring: [jeweler], [jeweler], and rockher.com.

For each one, find and quote the written policy on: diamond certification, who examines the diamond before it ships, whether the ring is made to order, resizing, warranty, returns, and whether the price changes with promotions.

Give me a table. Where you cannot find a written policy, say so plainly instead of guessing.

Use this when you are ready to ask a jeweler directly. A short, specific note gets a specific answer.

Write a short note to a jeweler about this ring: [link or description]. I want to ask: Is the diamond certified by GIA or IGI, and may I see the certificate? Who examines the diamond before it ships? Is the ring made to order, and how many business days does it take? What does the warranty cover? Is resizing complimentary, and for how long?

Keep it under 120 words, courteous and direct, in my own voice.