Most black diamond jewelry you see in stores and online is made with treated stones, not natural ones. That distinction matters more than most buyers realize, and it directly affects value, rarity, and what you are actually purchasing. Harsh Shah, Director at PASAVAJA Gems LLP and Graduate Diamonds (GIA), whose expertise in fancy color diamond grading is recognized at the highest levels of the trade, is direct about this: "Most black diamond jewelry on the market is treated, not natural.
There are diamonds, and then there are blue diamonds. Even among fancy color stones, natural blue diamonds occupy a category so rare and so scientifically fascinating that Harsh Shah, Director at PASAVAJA Gems LLP and one of the few diamantaires in the world whose GIA color grading discussions have contributed to actual certificate revisions, considers them among the most intellectually compelling stones he encounters.
If you have ever seen the term "chocolate diamond" on a jewelry tag and wondered what it actually means in gemological terms, you are not alone. Brown diamonds are one of the most misunderstood stones in the fancy color world, and one of the most aggressively marketed. Harsh Shah, Director at PASAVAJA Gems LLP and a specialist in fancy color diamond grading, has spent years cutting through exactly this kind of marketing confusion.
In his years of sourcing rare colored diamonds, including stones he has sent back to GIA for re-examination, some of which were regraded, Harsh has encountered only a handful of verified chameleon diamonds. That alone tells you how extraordinary they are. A chameleon diamond is the only natural diamond that temporarily changes color, shifting from a stable greenish-gray or greenish-yellow to a vivid orangy-yellow when gently heated or kept in complete darkness.
They sit largely outside the mainstream conversation, and that, as Harsh Shah will tell you, is exactly what makes them interesting. Harsh Shah, Director at PASAVAJA Gems LLP and one of the most recognized fancy color diamond specialists in the trade, has spent years studying the rarer corners of the color diamond market.
Natural green diamonds are among the most scientifically fascinating gemstones on earth, and one of the most misunderstood. When Harsh Shah, Director at PASAVAJA Gems LLP, Graduate Diamonds (GIA) and a fancy color diamond specialist, talks about green diamonds, he always starts with the same fact: the color you see may be just a whisper-thin layer at the surface of the stone.
Most people know that yellow diamonds get their color from nitrogen. What they don't know is that orange diamonds come from nitrogen too, but in an entirely different atomic arrangement that makes them significantly rarer than yellow. Harsh Shah, Director of PASAVAJA Gems and a specialist in fancy color grading, describes orange diamonds as "one of the most technically fascinating color origins in gemology." Where his reading of a stone differs from the issued grade, he takes it back to GIA, and orange diamonds sit firmly within that level of scrutiny.
Natural pink diamonds are among the rarest gemstones on earth. If you have ever been drawn to one, that soft, impossibly warm color that no other stone can match, you are not alone. Harsh Shah, Director at PASAVAJA Gems LLP and one of the world's most authoritative voices on fancy color diamonds, has spent years sourcing, grading, and advising on pink diamonds at the highest levels of the trade.
If you have ever come across a purple diamond and felt completely captivated, you are not alone. Purple diamonds sit in a rare category of fancy color stones that most people have never seen in person, and very few dealers can speak about with real authority. Harsh Shah, who has spent years studying the science and market behind fancy color diamonds at the highest level, finds purple diamonds particularly fascinating precisely because so much about them remains scientifically unsettled.
Natural red diamonds are the rarest diamonds on earth. Not just rare compared to pink or blue, but so extraordinarily scarce that fewer than 30 true natural red diamonds of any meaningful size are known to exist in the entire world. When Harsh Shah, Director at PASAVAJA Gems, Graduate Diamonds (GIA) and a fancy color diamond specialist whose expertise has directly contributed to GIA certificate revisions, talks about red diamonds, he describes them as "the one color that stops even experienced diamantaires in their tracks." That level of reverence says everything.
There is something about a yellow diamond that stops you in your tracks. That warm, sunlit glow, whether it is a soft lemon or a blazing canary, is unlike anything else in the natural diamond world. Harsh Shah, Director at PASAVAJA Gems LLP and one of the most authoritative voices on fancy color diamonds in the trade, has spent years sourcing, grading, and guiding buyers through exactly this category.
