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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.

Natural Melee vs Simulants (Moissanite, CZ): How to Tell Them Apart
19 min read

Natural Melee vs Simulants (Moissanite, CZ): How to Tell Them Apart

Moissanite and CZ aren't diamond at all, unlike lab-grown diamond. How thermal and electrical conductivity testers, refractive index, and doubling under magnification actually separate natural melee from simulants — and why per-stone testing doesn't scale to wholesale melee.

Natural Melee Pricing Across Sieve Sizes: 2026 Rate Guide
18 min read

Natural Melee Pricing Across Sieve Sizes: 2026 Rate Guide

The full 2026 natural melee rate card, sieve size by sieve size — see exactly what each sieve and mm band costs per carat across EF/GH color and VS/SI clarity, and why pricing is confirmed at quote, not fixed like a catalog.

Natural Melee for Eternity Bands: Sizing & Ordering Guide
18 min read

Natural Melee for Eternity Bands: Sizing & Ordering Guide

A practical sizing and ordering guide for natural melee eternity bands — carat math for full, three-quarter, and half coverage by ring size, calibration tolerance, and grade recommendations for wholesale buyers.

Lozenge Diamonds Wholesale Guide
16 min read

Lozenge Diamonds Wholesale Guide

Wholesale Lozenge (rhombus) lab-grown diamonds — calibrated elongated side stones for Art Deco-style settings and geometric accent work. IGI-gradable, NYC stock.

Matched Pair Step Cut Diamonds Wholesale
16 min read

Matched Pair Step Cut Diamonds Wholesale

Wholesale matched pair step cut lab-grown diamonds — two identical step-cut stones cut and matched together for stud earrings and symmetrical side-stone settings. IGI-gradable, NYC stock.