When Princess Diana's 12-carat sapphire engagement ring reappeared on Kate Middleton's hand in 2010, searches for royal blue sapphires spiked overnight and never fully receded. Royal provenance has shaped how the world values sapphires and rubies for centuries, and that history still drives what buyers ask for today. This article traces the royal lineage of these two gemstones and explains how to choose a stone with the same presence, without needing a crown to wear it.
The Sapphire That Started It All
Princess Diana's engagement ring, set with a 12-carat oval Ceylon sapphire surrounded by diamonds, remains the single most requested reference point in the sapphire trade. Its deep, saturated cornflower-to-royal blue hue became the benchmark against which countless sapphires are still compared, decades after the ring was chosen from a jeweler's catalogue rather than custom designed for royalty at all.
What made the ring enduring wasn't rarity of design but color. Ceylon (Sri Lankan) sapphires are prized for a bright, slightly violetish blue that photographs beautifully and reads as vivid in almost any light, which is precisely why the look has been imitated so widely since. Today, the closest equivalents come from Sri Lanka, Madagascar, and fine Burmese material, all judged against that same royal blue standard.
Rubies in the Crown Jewels
Ruby has an even older royal résumé. Burmese ruby, particularly stones from the Mogok Valley, was the preferred gem of Southeast Asian and South Asian royal courts for centuries, prized for a red so pure it was described as pigeon's blood. European crown jewels are full of large red stones once assumed to be rubies that later analysis revealed to be spinel, a mix-up that persisted well into the 20th century and still causes confusion among collectors sorting through old inventories.
Thailand's own royal history runs directly through ruby. Long before Bangkok became the world's cutting and certification hub it is today, Thai royal courts and traders dealt directly in ruby from Chanthaburi and, later, rough sourced from Myanmar and Mozambique. That trading infrastructure is the same one Thai Gems has operated within for over 70 years, connecting rough material from mining origins to finished, certified stones.
Why Royal Provenance Still Drives Demand
Royal association does something measurable to demand: it gives buyers a shared visual reference for what excellent color looks like, which lowers the guesswork in a category where quality is otherwise hard to describe over a screen. Auction houses routinely note when a lot has documented royal or aristocratic provenance, and those stones consistently command a premium over comparable, unprovenanced material.
The effect has extended well beyond historical royalty. When contemporary public figures are photographed in sapphire or ruby jewelry, search interest and inquiries for similar stones follow within days. Buyers aren't chasing the story so much as using it as a shortcut to a color and quality level they already know they want.
Choosing a Royal-Style Stone for Your Own Jewelry
You don't need a documented royal history to buy a stone with the same character. For a Diana-style sapphire, look for a well-saturated blue with medium-to-medium-dark tone, avoiding stones that skew too dark (which reads black in low light) or too pale. Oval and cushion cuts remain the closest match to the classic royal aesthetic, and both hold color exceptionally well.
- For sapphire, compare stones side by side under the same lighting rather than trusting photos alone, since hue and tone shift dramatically between light sources.
- For ruby, ask specifically whether a stone is Burmese, Mozambique, or Thai in origin, and request the lab report, since origin is a major driver of both color character and price.
- Decide on heated versus unheated early, since unheated stones with royal-grade color carry a significant premium and are considerably rarer at larger sizes.
Browse Thai Gems' current selection of sapphires, including stones cut and color-matched to the classic royal blue standard, or explore our ruby solitaires sourced from Burmese, Mozambique, and Thai origins. Every stone ships with independent certification, so you know exactly what you're buying before it becomes part of your own family's history.