Galle’s Muslim gem traders go back generations. Buy only with a certificate from the National Gem and Jewellery Authority, and take your time.
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Buy at an estate such as Handunugoda, or from a specialist shop; supermarket packs are fine for gifts.
Ask who made a piece and where. Check materials and shipping. Bargain politely only where invited; respect fixed prices in boutiques and artisan shops. Gem shops can be persistent; walk away politely if you feel pressured.