Top 10 Best Gemstones for Engagement Rings

Metal_Treasure
Of course, color is important. But engagement ring symbolism should be available in the qualities of the chosen gem - relationships are supposed to be long-lasting, so the gem should be hard, durable and resistant to scratching, cracking and chipping.

Gemstones to avoid for engagement rings - Pearl, Emerald, Opal (emeralds are pretty resistant to scratching, but they are extremely susceptible to cracking and chipping).

In this list I try to present the most suitable gem choices by several criteria that should be taken into account when choosing an engagement ring:

1) gem quality - nobody wants to see an engagement ring that gets scratched, cracked or chipped too soon (hardness on Mohs scale tells a lot about the gem quality though it isn't the only factor)

2) affordability - that's very important (I could put on this list only diamonds with different colors but how many people can afford diamonds?)

3) available color varieties of the gem (you need color choices).

The Top Ten

1 Colorless Diamond Colorless Diamond

The most common gem type I have seen used often. - htoutlaws2012

Hardness on Mohs Scale: 10.0 (10 is the highest, meaning the highest resistance to scratching).
Diamond is the most durable gem and yes, very beautiful.
Colorless diamonds are the classic engagement rings but not everyone can afford them. - Metal_Treasure

2 Sapphire Sapphire

Hardness on Mohs Scale: 9.0
Advantages:
1) it's very hard, durable and with incredible scratch resistance

2) sapphires come in every hue (except red) so you have color choices.

Sapphire is also the gemstone of royalty. Kate Middleton received a sapphire engagement ring that once belonged to Princess Diana, Prince William’s mother.

Other celebrities who had engagement rings with sapphires were the Empress Josephine, Penelope Cruz, and Elizabeth Hurley, to name a few - Metal_Treasure

3 Morganite Morganite

Hardness on Mohs Scale: 7.5 - 8.0
It's also known as "pink beryl", "rose beryl", "pink emerald", and "cesian (or caesian) beryl".
Advantages:
1) Morganite is pink-ish and most females would like the color because it's very feminine and sweet
2) Morganite hardness isn't the highest but it's still excellent and morganite is resistant to scratching
3) the gem is relatively affordable. - Metal_Treasure

4 Green Diamond Green Diamond

Hardness on Mohs Scale: 10.0
It's got all the great qualities of the diamond and it's just a color option if your girl likes green. It's pricey though - Metal_Treasure

5 Ruby

Hardness on Mohs Scale: 9.0
A classic, timeless choice for an engagement ring - you see it's one of the hardest gems (its hardness makes it durable and good looking after many years of wearing). Just make sure your girl likes red and would like a red engagement ring because you have no color choices. It's only red basically, with slight variations that can include pink-ish, purple-ish or orange hues - Metal_Treasure

6 Goshenite Goshenite

Hardness on Mohs Scale: 7.5 - 8

Goshenite is the colorless transparent variety of Beryl.

Advantages:

1) it looks like a diamond and can be confused with diamond but it's affordable - before the introduction of synthetic diamonds, goshenite was often used as a diamond alternative
2) like all beryls (except for emerald), goshenite has excellent hardness, durability and toughness

3) also, its excellent transparency was noticed long ago - it was once used for the manufacturing of eyeglasses because it was better than glass - Metal_Treasure

7 Topaz Topaz

Hardness on Mohs Scale: 8.0
Advantages:
1) pretty hard and durable
2) comes in many hues - colorless, blue, yellow, brown, orange, gray, green, pink and reddish pink
(on the image you see a red-ish brown-ish variety) - Metal_Treasure

8 Tourmaline Tourmaline

Hardness on Mohs Scale: 7 - 7.5

Green is the classic color of the gem but you have other color choices - blue, pink, purple, red, yellow - Metal_Treasure

9 Green Beryl Green Beryl

Hardness on Mohs Scale: 7.5 - 8.0
1) if you want a green gem but can't afford a green diamond or green sapphire, green beryl can be a good alternative
2) green beryl is also a great emerald alternative, because emerald is just a deep green variety of the same mineral (beryl) but emerald is extremely susceptible to cracking and chipping whereas green beryl isn't.
3) excellent hardness, toughness and resistance to corrosive substances
4) excellent affordability: $1/carat - $2/carat. For comparison, only lower quality emeralds are found at this price, whereas medium quality emeralds are priced at $5,000/carat - $9,000/carat.
Bottom line: green beryl is a quality gem at low price. It isn't expensive because it isn't rare. Emeralds are expensive because they are very rare and not because they are with better quality. - Metal_Treasure

10 White Star Sapphire

Hardness on Mohs Scale: 9.0 (excellent)
Star sapphire exhibits a rare asterism under specific lighting (a six-rayed star). - Metal_Treasure

The Contenders

11 Yellow Chrysoberyl Yellow Chrysoberyl

Hardness on Mohs Scale: 8.5 (excellent hardness)
Yellow chrysoberyl with a cat's eye effect is aka cymophane or cat's eye chrysoberyl.
Cat's eye became popular in the 19th century when the Duke of Connaught gave a cat's eye engagement ring. And why not? It looks like "milk and honey" - it has a sharp milky ray of white light on a honey-colored background. What would be better than a "milk and honey" marriage?
I added Yellow Chrysoberyl just to include the color yellow as a possible option, although many gems that were already mentioned have yellow varieties. - Metal_Treasure

12 Aquamarine Aquamarine

Aquamarines are for the Chinese dumbbutts

Hardness on Mohs Scale: 7.5 - 8
Its pale blue color is very beautiful but aquamarine will show scratches on its surface over time and it may even chip if the owner isn't careful. - Metal_Treasure

13 Red Spinel Red Spinel

It can be used as a ruby alternative - in Sanskrit writings red spinel is called the daughter of ruby - Metal_Treasure

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