Heated vs Unheated Ruby and Sapphire: What the Difference Is Worth
Heated and unheated ruby and sapphire are both natural. What heat really does, the full ladder of corundum treatments, and where the premium is real.
Heated and unheated ruby and sapphire are both natural. What heat really does, the full ladder of corundum treatments, and where the premium is real.
How to read a gem lab report: what GIA, Lotus and SSEF actually certify, the treatment wording that moves price, origin opinions, and when a report is worth it.
Why cobalt spinel commands the highest prices in the spinel family: the Fe/Co science from GIA research, Luc Yen sources, rarity, and how to judge a stone.
Ruby, red spinel and cobalt blue spinel from Luc Yen, Vietnam — geology, the Sunday market, real prices and how to buy, from a family trading here since 1990.
Same marble geology, very different prices. A Luc Yen trading family compares Vietnamese and Burmese ruby honestly — color, size, supply and value.
Red, pink, lavender and cobalt blue spinel from Luc Yen, Vietnam — colors, real prices, synthetics to avoid and how to buy, from a family at the source.
Where to buy ruby, spinel and sapphire in Vietnam — the real markets, fair prices, scams to avoid and the questions to ask, from a Luc Yen gem trading family.