How Much Does a Ruby Cost? 1 Carat Prices From a Gemologist

By Tarun Gupta, GIA Graduate Gemologist. Published 22 January 2020, updated 26 July 2026.

In the video tutorial I explain the method I use to answer the question “How much does a one carat ruby cost?”

One carat ruby prices range from about US$10 to US$20,000, depending on color, origin, and treatment (July 2026).

The method starts by categorizing the stone using the 4Cs plus OT. The six criteria are listed below.

How to Determine the Value of a Ruby

What Are the 4Cs Plus OT?

• Color
• Carat weight
• Clarity
• Cut
• Origin
• Treatment levels

Details for each of these are provided below.

Ruby Color Range

Hue

Hue is the color range. Examples of a ruby’s hue are:

• Red
• Purplish red
• Orangish red
• Pinkish red

Saturation

Saturation is the intensity of the hue present in a ruby. 100% is pure color, 0% is gray.

Tone

Tone is how light or dark a gemstone is, from very light (closer to white) to very dark (closer to black).

The ideal color range for a ruby is a red hue, high intensity saturation, and medium tone. In the trade this is called “pigeon blood.” These are the most expensive rubies.

Ruby Origin and Treatment

Origin, Most Expensive to Least Expensive

• Burma (Myanmar)
• Mozambique
• Thailand, Cambodia
• Madagascar
• Kenya, Tanzania
• Afghanistan, Pakistan

Origin affects price through the reputation of the source, the volume that mine is producing, and the quality of the material coming out of it.

Treatment, More Treatment Means a Lower Price

• Unheated and untreated, 100% natural ruby
• Heated ruby
• Heated, flux-healed ruby
• Lead-glass filled ruby

Please note, not all untreated or unheated rubies are expensive. The other criteria still have to be taken into account to determine the price.

Ruby Clarity Range

Inclusions, Eye Clean to Included

The fewer the inclusions, the more expensive the ruby. The more inclusions a stone has, the more they hurt its appearance, and the more the price falls.

Transparency, Transparent to Opaque

The more transparent the crystal, the more expensive the ruby. Opaque rubies are cheap, because a crystal that is not clear kills the stone’s fire and sparkle.

Ruby Carat Weight and Cut Grade

Carat Weight, Bigger Is More Expensive

The bigger the ruby, the pricier it gets, and per-carat price rises faster than weight.

Cut Shape and Grade

Octagon, round, and square cut rubies are generally more expensive than the common oval or cushion cuts. Marquise and pear shapes are usually cheaper. The cheapest cut is the cabochon, assuming it is not a star ruby.

On cut grade, the ideal range is proportional. Cut grade matters, but less than color, carat weight, origin, and treatment.

Six Rubies Compared

With the criteria above in place, the stones from the video can be compared directly. Five of the six were discussed on camera. The last one was not, and it is among the most expensive one carat rubies we have sold.

The prices below are the figures recorded at the time of the original comparison in 2020, kept here so the reasoning can be followed stone by stone. For current market ranges, see the Frequently Asked Questions below.

1.07 carats, Oval Burma Ruby (Flux Residue Treatment)

Price recorded: US$2,150

• Color
  • Hue: Vivid red
  • Tone: Dark
  • Saturation: Medium
• Carat weight: 1.07 carats
• Clarity: Eye-visible inclusions under the center of the stone
• Cut: Oval shape, Very Good with good proportion
• Treatment level: Heat treatment with flux residue, considered H(b)
• Origin: Myanmar (Burma)
• Product link: Certified 1.07 carat vivid red heated Burma ruby

1.00 carats, Round Burma Ruby (Normal Heat Treatment)

Price recorded: US$2,300

• Color
  • Hue: Vivid red, pigeon blood
  • Tone: Medium
  • Saturation: High intensity
• Carat weight: 1.00 carats
• Clarity: 100% eye-clean with no visible inclusions. Crystal is transparent.
• Cut: Round, Excellent, ideal round cut
• Treatment level: Normal heat treatment, called H(a)
• Origin: Burma (Myanmar)

1.00 carats, Oval Mozambique Ruby (No Treatment)

Price recorded: US$2,500

• Color
  • Hue: Vivid red, very slightly pinkish
  • Tone: Medium
  • Saturation: Intense
• Carat weight: 1.00 carats
• Clarity: 100% eye-clean with no visible inclusions. Crystal is transparent.
• Cut: Oval shape, Very Good to Excellent. Not perfectly proportional.
• Treatment level: No evidence of treatment found, 100% unheated and untreated
• Origin: Mozambique

1.01 carats, Marquise Burma Ruby (No Treatment)

Price recorded: US$100

• Color
  • Hue: Pinkish red
  • Tone: Medium
  • Saturation: Medium
• Carat weight: 1.01 carats
• Clarity: Heavily included with cloudy inclusions. Crystal is translucent because of them.
• Cut: Marquise shape, Very Good. The stone is proportional.
• Treatment level: No evidence of treatment found, 100% unheated and untreated
• Origin: Burma
  
  This stone is the clearest illustration of why origin and treatment alone tell you nothing. It is Burmese and completely untreated, and it is still worth US$100, because the color is pinkish rather than red and the crystal is translucent rather than transparent. Color and clarity have to be there first.

3.00 carats, Oval Mozambique Ruby (Glass-Filled)

Price recorded: US$20

• Color
  • Hue: Vivid red
  • Tone: Medium
  • Saturation: High
• Carat weight: 3.00 carats
• Clarity: Moderate inclusions. Crystal is transparent.
• Cut: Oval shape, Very Good to Excellent. The stone is proportional.
• Treatment level: Composite glass-filled ruby, very aggressively treated
• Origin: Mozambique

1.03 carats, Round Burma Ruby (No Treatment), Not in the Video

Price recorded: US$12,000

Shown on Instagram: 1.03 carat unheated Burma ruby

• Color
  • Hue: Vivid red, pigeon blood
  • Tone: Medium
  • Saturation: High intensity
• Carat weight: 1.03 carats
• Clarity: 100% eye-clean with no visible inclusions. Crystal is transparent.
• Cut: Round, Excellent. The stone is perfectly proportional.
• Treatment level: No evidence of treatment found, 100% unheated and untreated
• Origin: Burma (Myanmar)

Frequently Asked Questions

All figures below are illustrative, as of July 2026.

How much does a ruby cost?
Anywhere from a few dollars a carat to over US$100,000 a carat for exceptional Burmese material. That range is not evasive, it is the actual market. Ruby has the widest price range of any major gemstone, because color, origin, and treatment move the price far more than size does. A heavily treated commercial stone and a fine unheated one can look similar to an untrained eye and differ in price by a hundred times.

How much does a 1 carat ruby cost?
As of July 2026, roughly US$10 to US$500 for commercial quality, US$1,000 to US$4,000 for good color with visible inclusions, and US$4,000 to US$6,500 for a top vivid red unheated Mozambique stone. An unheated Burmese ruby of the same weight runs around US$20,000. Carat weight is the least useful number for pricing a ruby, which is why one carat covers so broad a span.

What is the price of a ruby per carat?
Per-carat price rises faster than weight, so a 2 carat stone costs more than twice a comparable 1 carat one. Fine ruby above 1 carat is genuinely scarce, and above 3 carat it becomes rare enough that each stone is priced individually rather than off any list. Below about half a carat, per-carat prices fall away sharply.

Why do ruby prices vary so much?
Six factors, and only one of them is size. Color comes first: a vivid red with no gray or brown modifier carries the highest price. Then treatment, then origin, then clarity, cut, and carat weight. Unlike diamonds, rubies have no global grading standard that fixes a price, so two stones with identical certificates can still trade at very different levels.

How much is my ruby worth?
No one can tell you from a photograph, and anyone who does is guessing. Value depends on whether the stone has been heated or treated, and on origin, neither of which is visible without laboratory testing. If it is a stone of any real value, a report from a recognized laboratory is the starting point. We look at stones for clients as part of our consultation service, but an honest answer needs the stone in hand or a certificate, not an image.

Do Burmese rubies cost more than Mozambique rubies?
Yes, substantially. Burma (Myanmar) has produced the finest red rubies on record, and a laboratory report confirming Burmese origin can multiply the price of an otherwise comparable stone several times over. Mozambique has become the most important commercial source of fine ruby and offers excellent top color material at more reasonable prices. Thailand, Madagascar, and Vietnam produce good stones below that again.

Does heat treatment affect a ruby’s price?
Heavily. Most rubies on the market have been heated, and normal heat treatment is accepted in the trade. An unheated stone of equal appearance commands a large premium because it is far rarer. Beyond normal heating the price falls away fast: flux-healed material is worth less, and lead-glass filled ruby is worth a small fraction of either. A lead-glass filled stone can also be damaged by ordinary jewelry repair and routine cleaning.

Is a ruby more expensive than a diamond of the same size?
At commercial quality, no. At fine quality, now yes. Natural diamond prices at the qualities most consumers buy have fallen sharply over the last three years while fine ruby has risen, and the two have crossed. A 1 carat diamond in the range most buyers choose now averages US$2,500 to US$3,000, while a top vivid red unheated Mozambique ruby of the same weight runs US$4,000 to US$6,500. For the full comparison, see Are Rubies More Expensive Than Diamonds?

How much is a small ruby worth?
Below roughly half a carat, ruby is priced as calibrated goods rather than as individual stones, and per-carat prices are a fraction of what the same quality commands at 1 carat and above. A small ruby of fine color is still worth having, but it will not carry the premium that size and rarity together create.

Contact us today for all your wholesale gemstone, diamond, and jewelry needs. We can source, search, and supply anything you require.

What will you get if you contact us

• Start a conversation with us at FB.com/ThaiNativeGems
• Wholesale and highly competitive prices on gemstones and diamonds from anywhere, through our extensive network of contacts around the world
• All stones sold by us are verified in house by our GIA Graduate Gemologist, or certified
• Personalized service, not the same old “one size fits all” approach

You can learn more by clicking here.

Tarun Gupta, GIA Graduate Gemologist

Third generation in the Thai gem trade, with family trading gemstones in Bangkok since 1959. Holds four GIA diplomas, Graduate Gemologist, Graduate Diamonds, Graduate Colored Stones, and Accredited Jewelry Professional, and has been a GIA alumnus since 2006. Member of the Thai Gem and Jewelry Traders Association.

Managing Director of Thai Native Gems (1960) Co., Ltd. in Bangkok, sourcing gemstones and diamonds to specification and custom making fine jewelry for clients in Europe, the United States, and Australia. Writes and moderates BuyGemstone.info.

View GIA credentials