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Insights & Guides

The Guru Diam Blog

Expert articles on lab-grown diamonds, wholesale sourcing strategies, and the latest trends shaping the jewelry industry.

Buying Lab-Grown Diamonds in NYC's Diamond District
17 min read

Buying Lab-Grown Diamonds in NYC's Diamond District

How wholesale lab-grown diamond buying actually works on 47th Street: what the district is, who sells there, how to open a trade account, what an appointment looks like, why a physical 36 W 47th address with US-held inventory matters, and how to buy remotely.

Which Lab-Grown Diamond Shapes & Sizes to Stock in 2026?
17 min read

Which Lab-Grown Diamond Shapes & Sizes to Stock in 2026?

A practical 2026 stocking framework for jewelers: which lab-grown diamond shapes and carat sizes to carry deep, which to special-order, and how calibrated melee, memo, and US-held inventory let a store stay lean without losing sales.

Wholesale Center Stones for Engagement Rings: A Guide
21 min read

Wholesale Center Stones for Engagement Rings: A Guide

A jeweler's playbook for sourcing lab-grown center stones at wholesale: which shapes and carat ranges sell as engagement centers, how to match side stones and halo melee, using memo to show a client real options, the certificates to insist on, and turning a sourced center into a finished ring in days.

How to Price Lab-Grown Diamonds: A Markup & Margin Guide
19 min read

How to Price Lab-Grown Diamonds: A Markup & Margin Guide

Keystone, triple-key, or target-margin? A trade guide to setting retail prices on lab-grown diamonds, with an illustrative markup table, why lab-grown needs a value-add over a price war, and how a low-cost wholesale source protects your margin.

How to Switch Your Lab-Grown Diamond Supplier
25 min read

How to Switch Your Lab-Grown Diamond Supplier

Thinking about changing your lab-grown diamond wholesaler? Here's the low-risk way to do it: spot the signs it's time to move, evaluate a replacement on the criteria that matter, run a small test order, and phase over your book without disrupting a single open job.

Lab-Grown Diamond Drop-Shipping & Blind Shipping Explained
17 min read

Lab-Grown Diamond Drop-Shipping & Blind Shipping Explained

Drop-shipping lets a jeweler sell a lab-grown diamond before owning it; blind shipping sends it to the client with no supplier branding. Here's the difference, the sell-first workflow, what to confirm with your supplier, and when it beats holding stock or memo.

Best Lab-Grown Diamond Suppliers (2026)
18 min read

Best Lab-Grown Diamond Suppliers (2026)

Skip the self-serving lists. This is an honest buyer's framework for jewelers comparing wholesale lab-grown diamond suppliers in 2026: production model, US-held inventory, lead time, certification, range, memo, feed/API, and drop-ship, with a criteria scorecard and guidance on weighting it for your own shop.

Wholesale Lab-Grown Diamonds in NYC
16 min read

Wholesale Lab-Grown Diamonds in NYC

A practical guide for jewelers on sourcing loose, IGI-certified lab-grown diamonds wholesale from the NYC Diamond District.