Tim and Co.
Switzerland
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Tim and Co. is headquartered in Geneva and sells certified lab-grown diamonds, with engagement rings and earrings alongside loose stones, and it also offers certified natural diamonds and a bespoke service for those who want a piece made to their own design. Prices on the site are shown in Swiss francs.
Because the seller sits in Switzerland, a Zurich buyer is dealing with a company in the same country, which keeps tax and delivery straightforward. The team takes appointments Monday to Saturday from 10:00 to 18:00, and there is a Geneva phone line for getting in touch.