Sunstone is a variety of natural feldspar prized for the sparkling, metallic glitter trapped inside its structure. But buying can be tricky. This is because natural sunstone ranges from nearly colorless to brilliant greens and reds. 

And not every genuine stone displays that signature sparkle called schiller. Moreover, we have to deal with Goldstone in the market, which is a manufactured glittering glass. It’s filled with copper crystals that make it look deceptively similar to sunstone.

The safest approach to real vs fake sunstone is to combine various tests. Because treatments and high-value materials (like Oregon sunstone) complicate things, no single home inspection is foolproof.

As always, we’ve put together an easy-to-understand guide to visual inspection, magnification, and gemological clues to help you spot a fake sunstone every time.

How to Tell if Sunstone Is Real: Quick Answer

To learn how to tell if sunstone is real, tilt it under a small light and inspect it with a 10x loupe. Natural sunstone usually shows directional reflections from irregular, oriented platelets. Goldstone tends to show dense, evenly distributed metallic crystals within glass. Weight and UV response can support the result, but neither is conclusive alone.

Test 1: The Aventurescence or Schiller Check

Aventurescence is the glittering effect created when light reflects from small, flat inclusions. In Oregon sunstone, these inclusions are commonly native copper. Other sunstones may owe their sheen to hematite, goethite, or related reflective minerals.

What to look for

Use one small, bright light and slowly tilt the stone. The following are some usual observations:

• Natural sunstone: The flash is often strongest at particular angles. It may move across the surface, brighten within a band or disappear as the stone turns.

  
• Goldstone: The sparkle is normally sharper, denser and visible from a wider range of angles because the metallic crystals are distributed throughout the glass.
  

This is a useful first step in sunstone authentication, but the stone’s cut, transparency and inclusion density affect what you see. A heavily included cabochon can look busier than a transparent faceted stone, while genuine material with very fine inclusions may show little visible schiller.

Test 2: The Density and Weight Test

Sunstone belongs to the feldspar group, but different feldspar species have different specific gravities. For instance, 2.58 for orthoclase sunstone, 2.65 for oligoclase sunstone, 2.70 for labradorite sunstone, etc.

Goldstone is commonly reported around 2.50 to 2.80, depending on its glass composition. The ranges overlap, so two similarly sized stones may feel almost identical in the hand.

Here, hydrostatic specific-gravity testing can add evidence for a loose stone. One of the best expert gemstone buying tips is to always consider your results alongside refractive index and magnification.  It is less useful for mounted gems, drilled beads, or pieces with attached findings. 

Test 3: The UV Light Test

UV reactions vary. Natural sunstone may be inert or show a weak response, while manufactured glass can fluoresce differently depending on its formula.

For example, GIA once tested 18 Ethiopian sunstones under UV. Eleven showed very weak orange fluorescence, and seven were inert under long-wave UV. Still, all showed very weak red fluorescence under short-wave UV. Similarly, a separate GIA examination of copper-bearing goldstone glass recorded weak green fluorescence under long-wave UV and weak-to-medium green under short-wave UV.

For a basic check:

1. View the stone in a fully darkened room.

2. Test it under long-wave UV, preferably around 365 nm.

3. Repeat under short-wave UV if suitable equipment is available.

4. Record the color, strength, and distribution of the reaction.

There is no universal UV result that proves a stone is natural sunstone or goldstone. UV should remain a supporting part of sunstone authentication, not a pass-or-fail test.

Test 4: Magnification and Inclusion Check

For accessible natural sunstone identification, magnification is usually the most useful test. Start with a clean 10x loupe. A gemological microscope at 20x or higher provides a clearer view.

In natural sunstone, look for:

• Flat platelets that vary in size, shape, and spacing

• Inclusions arranged in planes, bands, or directional groups

• Flashes that strengthen when a particular inclusion plane catches the light

• Natural feldspar features such as zoning or cleavage-related structures

In goldstone, look for:

• Numerous geometric metallic crystals

• A relatively even distribution of glitter

• Rounded gas bubbles, when present

• Flow lines or boundaries within the glass

Goldstone glass contains geometric copper crystals, trapped gas bubbles, and internal flow structure.

Gas bubbles are among the clearest fake sunstone signs, but their absence does not prove that a stone is natural. Some glass contains few visible bubbles, particularly within a small finished cabochon.

Magnification can usually separate obvious goldstone from feldspar. However, it may not reveal every color treatment. As a result, valuable red, green, or bicolor material can still require laboratory testing.

Goldstone vs Real Sunstone: The Detailed Difference

The main distinction between goldstone vs sunstone is the material itself. Sunstone is natural feldspar. On the contrary, Goldstone, also called aventurine glass, is manufactured glass containing metallic crystals.

Aventurine glass was developed in Murano, Venice, around the end of the 16th or beginning of the 17th century. It is a historic decorative material, not a mineral species.

Feature	Natural sunstone	Goldstone
Material	Natural feldspar	Manufactured glass
Sparkle source	Copper, hematite, goethite or other reflective inclusions	Metallic crystals formed within glass
Flash pattern	Often directional and angle-dependent	Usually dense and broadly visible
Magnified appearance	Irregular platelets, often arranged in planes	Geometric crystals with more uniform spacing
Other clues	Feldspar zoning or cleavage-related features	Possible gas bubbles and flow lines
Correct description	Natural sunstone, with treatments and origin disclosed where known	Goldstone or aventurine glass

Oregon Sunstone: Why It Commands the Highest Premiums

Oregon sunstone is natural copper-bearing labradorite. The finest deep red, deep green, and intense bicolor stones are particularly sought after.

But origin alone does not determine value. Color, clarity, size, cutting, and optical character remain important.

Oregon sunstone has several important sources, including:

• Ponderosa Mine

• Dust Devil Mine

• Sunstone Butte Mine

These localities produce copper-bearing labradorite ranging from near-colorless and pale yellow to red, green, and bicolor material. Because Oregon sunstone commands the highest prices on the market, it is naturally the most-imitated variety. Additional authentication for these premium stones often requires source documentation. 

For a higher-value purchase, support natural sunstone identification with:

• A written invoice naming the material and claimed origin

• Full treatment disclosure

• Mine or supplier documentation where available

• An independent laboratory report when the value justifies it

Where to Buy Authentic Sunstone Safely

Buy sunstone from sellers who clearly distinguish natural sunstone from goldstone or aventurine glass. They must also disclose treatments and provide accurate origin information. Clear photos or videos and a fair return policy also make it easier to verify the stone before committing.

At Gemstones For Sale, stones are individually photographed, and treatment details are disclosed to help buyers shop with confidence. For more quality checks, see our sunstone buying guide.

Final Thoughts

Distinguishing real vs fake sunstone involves observing directional schiller, inclusion patterns, gemological properties, and clear treatment disclosure should support one another. For higher-value red, green or bicolor stones, professional testing remains the safest way to resolve uncertainty.

For jewelry traders, Gemstones For Sale’s sunstone collection offers a more transparent way to source from Jaipur without unnecessary middlemen. We provide authentic photographs, dimensions, carat weights, and available origin or treatment details before ordering. Our worldwide delivery network caters to independent designers, B2B jewelry sellers, manufacturers, and more.

Skip the guesswork and the glass imitations. Browse our verified sunstone inventory today and add some authentic, natural sparkle to your next design.

FAQ: Real vs Fake Sunstone

Is goldstone a real gemstone?

Goldstone is a genuine jewelry-making material, but it is not a natural mineral or a variety of sunstone. It is manufactured glass containing reflective metallic crystals.

Can dyed feldspar be sold as sunstone?

The seller should accurately identify the material and disclose the treatment. Dyeing pale feldspar orange or red does not automatically make it natural sunstone. Treated material should not be represented as untreated.

Is Oregon sunstone always more valuable than Indian sunstone?

No. Fine Oregon red, green, and bicolor stones can command strong premiums, but a pale or poorly cut Oregon stone may be less desirable than an attractive Indian sunstone with lively aventurescence. Quality and disclosure matter more than origin alone.

Does a certificate prove sunstone is real?

A report from a reputable gemological laboratory can provide strong evidence of identity and disclose detectable treatments. Check that its photograph, measurements, and weight match the stone. A generic seller-issued “certificate” is not equivalent to independent laboratory testing.