Comparison · Materials vs Minerals
Goldstone vs Grossular
Goldstone and Grossular are easy to confuse. Grossular is harder (Mohs 6.5–7.5) than Goldstone (Mohs 5.5), so Grossular will scratch Goldstone and not the other way round. It is about as hard as window glass: a knife barely marks it, while a steel file (Mohs 6.5) will. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Goldstone and Grossular
- Grossular is harder (Mohs 6.5–7.5) than Goldstone (Mohs 5.5), so Grossular will scratch Goldstone and not the other way round. It is about as hard as window glass: a knife barely marks it, while a steel file (Mohs 6.5) will.
- Streak color differs: Goldstone leaves a white to colorless streak on unglazed porcelain, Grossular leaves white.
- Grossular feels noticeably heavier for its size (specific gravity 3.4–3.8 versus 2.5 for Goldstone).
- Hold a thin edge to the light: Goldstone is opaque, Grossular is Transparent to translucent.
- They overlap in orange, brown, and yellow, but Grossular also comes in clear, green, and pink.
- Well-formed crystals give it away: Goldstone is amorphous, Grossular is Cubic.
Goldstone vs Grossular properties
| Property | Goldstone | Grossular |
|---|---|---|
| Type | Materials | Minerals |
| Mohs hardness | 5.5 | 6.5–7.5 |
| Luster | vitreous | Vitreous to resinous |
| Streak | White to colorless | White |
| Transparency | opaque | Transparent to translucent |
| Specific gravity | 2.5 | 3.4–3.8 |
| Crystal system | amorphous | Cubic |
| Common colors | Copper, Brown, Orange, Gold, Sparkly | Colorless, Green, Yellow, Orange (hessonite), Brown, Pink |
| Rarity | common | common |
| Typical specimen value | $3–$80+ | $2–$150+ |
Which is more valuable?
Grossular is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Goldstone, and premium Grossular can reach $150 or more.
About Goldstone
Goldstone is a manufactured glittering glass, usually coppery brown to orange, sold as beads, cabochons, and tumbled stones.
About Grossular
Grossular is the calcium aluminum member of the garnet group, Ca3Al2(SiO4)3, notable for its unusually broad color range that spans colorless, green, yellow, orange, red, and brown depending on trace element substitutions. It forms characteristically in calcium-rich metamorphic rocks such as skarns and impure marbles, where it crystallizes during contact or regional metamorphism. Its name derives from the botanical genus for gooseberries, referencing the pale green color of the type specimens from Siberia.
Goldstone vs Grossular FAQ
Is Goldstone the same as Grossular?
No. Goldstone is a material while Grossular is a mineral. Grossular is harder (Mohs 6.5–7.5) than Goldstone (Mohs 5.5), so Grossular will scratch Goldstone and not the other way round. It is about as hard as window glass: a knife barely marks it, while a steel file (Mohs 6.5) will.
How can you tell Goldstone from Grossular?
Grossular is harder (Mohs 6.5–7.5) than Goldstone (Mohs 5.5), so Grossular will scratch Goldstone and not the other way round. It is about as hard as window glass: a knife barely marks it, while a steel file (Mohs 6.5) will. Streak color differs: Goldstone leaves a white to colorless streak on unglazed porcelain, Grossular leaves white. Grossular feels noticeably heavier for its size (specific gravity 3.4–3.8 versus 2.5 for Goldstone).
Which is harder, Goldstone or Grossular?
Grossular is harder: Mohs 6.5–7.5 against Mohs 5.5 for Goldstone.
Which is more valuable, Goldstone or Grossular?
Grossular is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Goldstone, and premium Grossular can reach $150 or more.
