Ruby (Manik) Buying Guide: Colour, Origins, Treatments and Price
“Ruby (Manik) is red corundum and the gem of the Sun in Vedic tradition. Learn how to judge its colour, how Burmese, Mozambique, African and Bangkok rubies compare, what heated and glass-filled mean, and what ruby really costs.”
Ruby, called Ratnaraj — the king of gems — in Sanskrit and known in India as Manik, has been prized for its red for thousands of years. In Vedic tradition it is the gemstone of the Sun (Surya). Ruby also has the widest price spread of any coloured stone, from a few hundred rupees a carat to the price of a house, so this guide explains what actually sets the price: colour, origin and, above all, treatment. You will learn how to judge colour, how the main origins compare, how heated, glass-filled and beryllium-treated rubies differ, and what to check before you buy.
Quick answers: Ruby is red corundum (Mohs 9, SG about 4.00), coloured by chromium. Most rubies are heated; Bangkok Manik is heated and glass-filled, a disclosed treatment that makes it affordable but needs gentle care. At Ratna Gems (October 2026), Bangkok Manik costs about ₹450–975 per carat, natural unheated African ruby about ₹2,200–2,350, and natural unheated Mozambique ruby about ₹2,600–4,230, each with an independent laboratory report — see the Ruby collection.
Ruby (Manik) Chemical & Physical Specifications
| Gemstone Family | Corundum |
| Chemical Composition | Aluminum Oxide (Al₂O₃) with chromium (Cr³⁺) traces acting as the red chromophore |
| Ruling Planet | Sun (Surya) |
| Mohs Hardness | 9 (very durable; suits everyday rings and pendants) |
| Specific Gravity | About 3.97 - 4.05 |
| Refractive Index | 1.762 - 1.770 |
Manik in Vedic Tradition
In Vedic tradition, ruby is the main gemstone of the Sun (Surya), the planet traditionally linked with leadership, vitality, the soul and authority. The customs below are the ones most often followed; whether a stone suits you, and at what weight, is for your own astrologer or Pandit ji to advise.
Traditional Manik Wearing Customs
| Planet | The Sun (Surya), ruler of Leo (Simha) in Vedic astrology |
| Usual Weight | About 1 Ratti per 10 kg of body weight by custom (1 pakki Ratti = 0.91 carat) |
| Finger | Ring finger (Anamika) of the working hand |
| Metal | Gold or copper |
| Customary Day | First worn on a Sunday morning during Shukla Paksha, after a rinse in Gangajal and raw milk |
| Associated Mantra | "Om Suryaya Namah" (ॐ सूर्याय नमः) |
How to Buy an Original Ruby Stone: A Step-by-Step Guide
Step 1: Prioritise Colour
Color is the single most important factor in a Ruby's valuation. The standard benchmark is a pure, highly saturated crimson red to a slightly purplish-red. Rubies rich in chromium and low in iron can show strong red fluorescence, even in daylight, which makes the finest stones seem to glow from within. Too dark, too brown or too pink a stone is worth less.
Understanding "Pigeon's Blood" Red: This legendary term refers to the most prized ruby color. It describes a pure, vivid, saturated red with strong red fluorescence. Historically associated with marble-hosted rubies from Mogok in Myanmar, the term is now used by some laboratories for exceptional stones from other sources, including Mozambique. It is a trade colour term, not a guarantee of origin.
Step 2: Understand Ruby Origins
Where a ruby forms affects its chemistry, its inclusions and its colour. Origin is a reputation rather than a grade — every source produces stones of every quality — but these are the broad patterns:
Comparison of Major Ruby Origins
| Origin | Typical Color & Geology | Inclusions & UV Fluorescence | Market Value & Rarity |
|---|---|---|---|
| Burmese (Mogok, Myanmar) | Vivid "Pigeon's Blood" Red. Marble-hosted (low iron). | Fine intersecting rutile "silk" at 60°/120° angles creating velvety luster; twin-cleaved calcite/dolomite. Strong red fluorescence. | The highest premium; fine stones are very scarce. |
| Mozambique (Montepuez) | Brilliant crimson red to deep purplish-red. Amphibolite-hosted (moderate iron). | Often good clarity; weaker fluorescence than Burmese stones. | High. The leading modern source of fine ruby. |
| Thailand (Chanthaburi–Trat) | Darker, brownish or purplish red ("Siam red"). Basalt-hosted (high iron). | High iron suppresses fluorescence, so stones can look darker. | Moderate. Usually heated. |
| African (Madagascar/Tanzania) | Varies from bright pinkish-red to deep dark red. | Variable clarity; often shows mineral crystals and healed fissures. | Variable; a good source of affordable untreated ruby. |
What "Bangkok ruby" means in India: in the Indian trade, Bangkok Manik is the name for ruby that has been heated and glass-filled — a treatment carried out in Thailand's gem trade — rather than a mining origin. It is disclosed as heated and glass-filled on every Ratna Gems listing.
Step 3: Assess the Clarity
Due to the chaotic environments in which corundum forms, completely clean natural rubies are practically non-existent. A high-quality ruby should be "eye-clean" (inclusions not visible to the naked eye). Fine rutile needles ("silk") meeting at 60° and 120° can soften light into a velvety glow and are a strong sign of natural, unheated origin, because strong heating dissolves them. Be wary of a large, perfectly clean, cheap ruby: it may be synthetic.
Step 4: Examine the Cut and Brilliance
Rubies are usually cut as ovals or cushions to save weight from the rough crystal. A master cutter will orient the stone to showcase its best red color while minimizing the visibility of inclusions, avoiding a "window" (leaking light) in the center of the gemstone.
Step 5: Understand Price (2026)
The weight of a ruby is measured in carats or traditional Ratti (1 pakki Ratti = 0.91 carat). Ruby has the widest price spread of any coloured stone — the same species runs from a few hundred rupees a carat to several lakhs — so a single "ruby price" figure is meaningless. What decides it is origin, treatment and colour, in that order of impact.
Ratna Gems Ruby Prices (in stock, October 2026)
| Type | Treatment | Price per carat |
|---|---|---|
| Bangkok Manik | Heated, treated and glass-filled, disclosed on every listing | About ₹450 – ₹975 |
| African Ruby | Natural, unheated and untreated | About ₹2,200 – ₹2,350 |
| Mozambique Ruby | Natural, unheated and untreated | About ₹2,600 – ₹4,230 |
For example, a 10.05 carat (11.04 ratti) Bangkok Manik costs ₹6,030, an unheated African ruby of 6.83 carats (7.51 ratti) costs about ₹15,850, and an unheated Mozambique ruby of 7.39 carats (8.12 ratti) costs ₹19,253. Finer Mozambique and Burmese stones cost far more, and are bought individually rather than from a price list. Buyers who need a larger Ratti weight than faceted ruby makes practical can look at Star Ruby (Sitara Manik), the same species at a lower rate, or at the Surya upratnas in our gemstone buying guide. Ruby and Blue Sapphire are both corundum, so the treatment vocabulary on this page applies to both.
There is no ceiling on ruby. Unheated Burmese pigeon's blood stones have sold above US$1,000,000 per carat at auction, and no dealer anywhere stocks the top of the category — that material moves privately between collectors and never reaches a retail shelf. The figures you see quoted online as "the ruby price" are almost always drawn from this rarefied end, which is why so many buyers arrive convinced that any ruby under a lakh a carat must be false. It is not. Decide what you can comfortably spend first, then buy the best colour available inside it. A genuine, well-coloured stone with its treatment disclosed, inside your budget, serves its purpose; an unaffordable one serves nothing.
Step 6: Know the Treatments (Heated, Glass-Filled, Beryllium-Diffused)
Most rubies on the market are heated to improve colour and clarity, a stable and widely accepted treatment that should still be disclosed. Two further treatments must always be named on the listing and the report:
- Lead-Glass Filled Rubies: corundum whose surface-reaching fissures are filled with lead glass, so that they show far less and the color reads richer. This is how Bangkok Manik is made, and it is why it costs a fraction of an untreated stone. The glass is much softer than corundum (about 6 on the Mohs scale): household acids (lemon juice, vinegar), ultrasonic cleaners and a jeweler's torch can etch it or turn it white, so the stone needs gentle care. Under 10x magnification, filled fissures show trapped gas bubbles and the "Flash Effect" (iridescent blue/orange flashes in cracks). Sold openly as glass-filled, at a glass-filled price, it is a fair product; sold as an untreated ruby, it is fraud.
- Beryllium Diffusion: High-temperature heating (>1800°C) with beryllium to force chemical color changes. Because the colour change can go deep into the stone, this treatment can only be detected via advanced laboratory testing, such as LA-ICP-MS (Laser Ablation Mass Spectrometry) or SIMS.
Step 7: Ask for a Laboratory Report
Buy from a seller who provides a report from an independent gemological laboratory stating that the ruby is natural rather than synthetic, and its treatment: unheated, heated, or heated and glass-filled. Every Ratna Gems stone ships with such a report at no extra charge, and on the product page you can add a GII, IIGJ or IGI report, priced by carat weight; if origin matters to you, choose an origin report. Our guide to buying gemstones online safely explains how to verify a report yourself.
Why Buy Your Ruby from Ratna Gems?
At Ratna Gems, we describe every stone plainly and price it openly:
- An Independent Lab Report With Every Stone: every Manik ships with a report from an independent, ISO-certified gemological laboratory at no extra charge, and you can add a GII, IIGJ or IGI report on the product page, priced by carat weight.
- Treatment Named on Every Listing: Bangkok Manik is sold as heated, treated and glass-filled; African and Mozambique ruby as unheated and untreated — each with its weight in carats and ratti and its price per carat.
- Help When You Need It: questions answered before and after you buy, and a 7-day return policy for eligible items.
Frequently Asked Questions
Which is the best origin for Ruby?
Burmese rubies from Mogok are the historic benchmark, prized for their strong red fluorescence. Mozambique rubies from Montepuez are the leading modern source, often with good clarity and rich colour. But origin is not a grade: judge the individual stone on colour, clarity and disclosed treatment.
What is the difference between Ruby and Red Spinel?
While they look similar and were historically confused (such as the famous "Black Prince's Ruby" in the British Crown Jewels, which is actually a red spinel), they are mineralogically distinct. Ruby is a corundum (hardness 9, specific gravity ~4.0) while Spinel is a magnesium aluminum oxide (hardness 8, specific gravity ~3.6). A gemological lab can easily distinguish them using refractive index or Raman spectroscopy.
What is the difference between a heated and a glass-filled ruby?
Heat treatment is a stable, permanent, and widely accepted method to improve color and dissolve rutile silk. Lead-glass filling fills surface-reaching fissures with lead-based glass so that they show less; it is not permanent in the same way, because the glass can be damaged by heat and chemicals. Glass-filled rubies therefore need gentle care — even a mild acid such as lemon juice can etch the glass — and they are bought for their color and price rather than for resale value.
How should I care for my Manik jewelry?
Natural and standard heat-treated rubies are highly durable (hardness 9) and can be cleaned with warm, soapy water and a soft brush. However, lead-glass filled rubies must never be exposed to acids, steam cleaning, or ultrasonic units as it will melt, etch, or shatter the glass filler.
Looking for Original Certified Gemstones?
Explore our lab-tested inventory of natural Ceylon Sapphires, Zambian Emeralds, Mozambique Rubies, and Original Nepali Rudrakshas with official certificate.
