White Label and OEM Lab-Grown Diamond Jewelry from Istanbul: IGI-Certified Wholesale Guide
Lab-grown diamonds have moved from a niche to the mainstream in the US. According to The Knot, 61% of US engagement ring purchases in 2025 had a lab-grown centre stone, and BriteCo appraisal data shows lab-grown stones outnumbering natural ones for the first time in the first half of 2026. Brands and jewelers who want to serve this demand need a manufacturer that can produce reliably. This guide explains how white label and OEM production works with OSKA Silver in Istanbul.
White label, private label and OEM: what is the difference?
- White label: you choose existing, already-tooled models from our collection and sell them under your brand. This is the fastest start.
- Private label: a series made for your brand with your choices of karat, colour, stone and finish.
- OEM or custom: your own design or CAD file is developed, sampled and produced. The design is never made for anyone else.
What sells right now
US appraisal data from BriteCo shows yellow gold at 39% and white gold at 38% of lab-grown engagement rings in 2025, with white gold down from 51% in 2019. The Knot reports round (26%) and oval (25%) as the most chosen shapes. Average centre stones keep getting larger because lab-grown stones cost less per carat. For fine jewellery, 14k is the most requested karat in the US, with 10k for entry price and 18k popular in Europe. 925 silver with rhodium suits fashion collections.
IGI-certified lab-grown diamonds
For centre stones we supply IGI-graded lab-grown diamonds and can work with stones you supply. Always match the report number to the stone. Small accent stones in tennis bracelets and pavé pieces are matched by size, colour and clarity.
How an order works
- Send your model, metal, karat, stone and quantity for a quotation.
- A paid sample is made. Its cost is deducted if the sample becomes an order.
- Payment terms: deposit, with the balance at delivery.
- Orders ship worldwide with insurance. Every piece carries a hallmark.
Minimum order quantity depends on the model; ask us for the model you are interested in.
Why Istanbul?
Our workshop is in the Grand Bazaar area, with CAD design, casting, stone setting, plating and finishing under one roof, so sample changes are quick and communication is direct. We are an ITO-registered manufacturer.
Private label · Custom jewellery manufacturing · Request a quote · Lab-grown vs natural diamonds