Calibrated Gemstones

Calibrated gemstones carry a 20–40% premium over freeform stones, ranging from $3–$15 per carat for commercial stones (amethyst, garnet, topaz) and $30–$200+ per carat for premium calibrated sapphire, ruby, and emerald. Every calibrated stone at Gemstones For Sale is priced individually — single-stone or multi-stone orders at the same rate.

Premium calibration tolerance is ±0.1mm, suitable for pre-made bezel and prong settings used in production jewelry. Commercial calibration runs ±0.3mm and is acceptable for handmade settings. Always confirm tolerance standards before ordering for production runs requiring exact fits.

Gemstones For Sale stocks calibrated stones in all standard production sizes (3mm, 4mm, 5mm rounds; 6x4, 7x5, 8x6 ovals; matched melee parcels) with individual per-stone pricing and tolerance certification on premium grades. Single stones and parcels priced at the same per-piece rate.

The most-used calibrated sizes are 3mm and 4mm round melee (for halos and accents), 6x4mm and 8x6mm ovals (for solitaire pendants and rings), and 5mm rounds (for stud earrings). These five sizes cover roughly 70% of mass-production jewelry.

Verify size tolerance (±0.1mm for premium, ±0.3mm for commercial), cut consistency across the parcel, color match (especially for melee parcels), treatment disclosure, and certification for stones above $300. Request the actual parcel photo, not catalog images.