All gemstones sold by Gem-Fountain are:

• Authentic — no imitations sold as natural gemstones.
• Truthfully described — species/variety, measurements, weight, and visible characteristics.
• Presented honestly — no misleading colour filters or "beauty edits".

Our office and workshop are equipped with standard gemological instruments used routinely to verify identity and key characteristics:

…and additional professional tools used in day-to-day gem trading.

Each gemstone comes with our own Gem-Fountain Gemstone Report, confirming:

• Authenticity — based on our in-house examination.
• Key specifications — weight, measurements, cut style, colour description, and clarity observations shown on the product page.

For certain gemstones — especially rubies, sapphires, and emeralds — important questions may arise regarding treatments and enhancements, such as:

• Low-temperature heat treatment
• Beryllium diffusion
• Artificial resin filling
• Traditional oiling (emeralds)

Where such questions are relevant, these gemstones are submitted to Bangkok-based, internationally recognised laboratories for certification:

If you would like an additional certificate from an independent laboratory, you may add it as an optional service during checkout.